<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c8c8f-e7ce-71cd-993c-56cbf358e2fe,g:31ee682d-b8a6-48a6-a582-0f95b9d71466-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.transunion.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="tru-20260331.xsd#ConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c8c8f-e929-740b-acad-c25ed21f9a38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c8c8f-e929-73fb-ac42-1f0df2b42bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c8c8f-e929-740b-acad-c25ed21f9a38" xlink:to="loc_us-gaap_StatementTable_019c8c8f-e929-73fb-ac42-1f0df2b42bd8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e929-74e2-ad2c-58f27200d252" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8c8f-e929-73fb-ac42-1f0df2b42bd8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e929-74e2-ad2c-58f27200d252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-74e2-ad2c-58f27200d252_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e929-74e2-ad2c-58f27200d252" xlink:to="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-74e2-ad2c-58f27200d252_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e929-74e2-ad2c-58f27200d252" xlink:to="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c8c8f-e929-7a24-8c36-c9f6c4b2ab91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_CommonStockMember_019c8c8f-e929-7a24-8c36-c9f6c4b2ab91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c8c8f-e929-7884-99aa-5410b86e7475" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c8c8f-e929-7884-99aa-5410b86e7475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c8c8f-e929-7cbe-990c-760eea9ee022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c8c8f-e929-7cbe-990c-760eea9ee022" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c8c8f-e929-74b5-9d83-85b68c8f58e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_RetainedEarningsMember_019c8c8f-e929-74b5-9d83-85b68c8f58e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e929-78d6-9d05-cb469062ad12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e929-78d6-9d05-cb469062ad12" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019c8c8f-e929-7e0c-a040-46dcf7c435ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019c8c8f-e929-7e0c-a040-46dcf7c435ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ParentandNoncontrollingInterestsMember_019c8c8f-e929-7fcd-a149-ceac934f0540" xlink:href="tru-20260331.xsd#tru_ParentandNoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e929-7b23-bd99-5a0a043a8f28" xlink:to="loc_tru_ParentandNoncontrollingInterestsMember_019c8c8f-e929-7fcd-a149-ceac934f0540" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8c8f-e929-740b-acad-c25ed21f9a38" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_019c8c8f-e929-7ee8-af2e-fdf20fef57d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_SharesOutstanding_019c8c8f-e929-7ee8-af2e-fdf20fef57d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e929-7a46-b6cb-8320ca64db00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e929-7a46-b6cb-8320ca64db00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c8c8f-e929-7c69-b3da-5a7f4c45b3a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_ProfitLoss_019c8c8f-e929-7c69-b3da-5a7f4c45b3a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019d972d-70ee-7b71-a2cd-b965072ee444" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019d972d-70ee-7b71-a2cd-b965072ee444" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8c8f-e929-7ce4-b833-881215a28468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8c8f-e929-7ce4-b833-881215a28468" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c8c8f-e929-76fb-a1b5-d5868081eaf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c8c8f-e929-76fb-a1b5-d5868081eaf9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019c8c8f-e929-7c57-a465-662e391aff4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019c8c8f-e929-7c57-a465-662e391aff4c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019c8c8f-e929-7a83-a887-1c0e4242ac65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019c8c8f-e929-7a83-a887-1c0e4242ac65" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019c8c8f-e929-7a2d-ba08-01cefd5ebd85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019c8c8f-e929-7a2d-ba08-01cefd5ebd85" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019c8c8f-e929-7082-9786-9d18e96c9c54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019c8c8f-e929-7082-9786-9d18e96c9c54" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c8c8f-e929-7a18-a33e-5764792b8ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c8c8f-e929-7a18-a33e-5764792b8ff3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c8c8f-e929-7d1a-88d4-695c2b47ec79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c8c8f-e929-7d1a-88d4-695c2b47ec79" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019c8c8f-e929-7d56-a6c3-9f2efc166157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019c8c8f-e929-7d56-a6c3-9f2efc166157" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_019c8c8f-e929-7a58-909b-d5bc2432eb23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8c8f-e929-7837-9a40-1088d3219f70" xlink:to="loc_us-gaap_DividendsCash_019c8c8f-e929-7a58-909b-d5bc2432eb23" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_019c8c8f-e929-7347-9406-508cd5795d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e929-74df-8699-e67017df52ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019c8c8f-e929-7f2f-821a-c813f84c4ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8c8f-e929-740b-acad-c25ed21f9a38" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019c8c8f-e929-7f2f-821a-c813f84c4ad1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/SignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#SignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/SignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:href="tru-20260331.xsd#tru_LongLivedAssetLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_LongLivedAssetTable_019c8c8f-e929-7d50-9b61-f62991e40d9f" xlink:href="tru-20260331.xsd#tru_LongLivedAssetTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_tru_LongLivedAssetTable_019c8c8f-e929-7d50-9b61-f62991e40d9f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7e59-a50d-fffc867a915b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tru_LongLivedAssetTable_019c8c8f-e929-7d50-9b61-f62991e40d9f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7e59-a50d-fffc867a915b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e59-a50d-fffc867a915b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7e59-a50d-fffc867a915b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e59-a50d-fffc867a915b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7a27-be95-6ecb25a39edf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7e59-a50d-fffc867a915b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7a27-be95-6ecb25a39edf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternalUseSoftwareMember_019c8c8f-e929-7fa7-b9c6-603a786e3e2d" xlink:href="tru-20260331.xsd#tru_InternalUseSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7a27-be95-6ecb25a39edf" xlink:to="loc_tru_InternalUseSoftwareMember_019c8c8f-e929-7fa7-b9c6-603a786e3e2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-77e5-9812-61f4c0ea725f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tru_LongLivedAssetTable_019c8c8f-e929-7d50-9b61-f62991e40d9f" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-77e5-9812-61f4c0ea725f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-77e5-9812-61f4c0ea725f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-77e5-9812-61f4c0ea725f" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-77e5-9812-61f4c0ea725f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7be9-9adc-6f0774345a13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-77e5-9812-61f4c0ea725f" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7be9-9adc-6f0774345a13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019c8c8f-e929-747d-8e25-0e8efa8cc10d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tru_LongLivedAssetTable_019c8c8f-e929-7d50-9b61-f62991e40d9f" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019c8c8f-e929-747d-8e25-0e8efa8cc10d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019c8c8f-e929-747d-8e25-0e8efa8cc10d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019c8c8f-e929-747d-8e25-0e8efa8cc10d" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019c8c8f-e929-747d-8e25-0e8efa8cc10d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019c8c8f-e929-7a05-92d6-fd9a5a7748a1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019c8c8f-e929-747d-8e25-0e8efa8cc10d" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019c8c8f-e929-7a05-92d6-fd9a5a7748a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ShareRepurchasePlan2025Member_019c8c8f-e929-7a54-b24a-751cb5ca8a2a" xlink:href="tru-20260331.xsd#tru_ShareRepurchasePlan2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019c8c8f-e929-7a05-92d6-fd9a5a7748a1" xlink:to="loc_tru_ShareRepurchasePlan2025Member_019c8c8f-e929-7a54-b24a-751cb5ca8a2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_019c8c8f-e929-749e-ad51-d8031dad826e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_019c8c8f-e929-749e-ad51-d8031dad826e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019c8c8f-e929-7b60-898a-5ca175ee4bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019c8c8f-e929-7b60-898a-5ca175ee4bda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMaximumLossExposureAmount_019c8c8f-e929-718a-a552-70455e78bc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMaximumLossExposureAmount_019c8c8f-e929-718a-a552-70455e78bc73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c8c8f-e929-7761-8b68-79634112d14b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c8c8f-e929-7761-8b68-79634112d14b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c8c8f-e929-7988-b608-9fadf743ca45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c8c8f-e929-7988-b608-9fadf743ca45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c8c8f-e929-7afc-8eac-9101f699b463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c8c8f-e929-7afc-8eac-9101f699b463" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019c8c8f-e929-748e-9667-ae335a470370" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019c8c8f-e929-748e-9667-ae335a470370" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019c8c8f-e929-7459-9c98-bfacaa626f87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_LongLivedAssetLineItems_019c8c8f-e929-71e0-9c1a-ee34b1a71e97" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019c8c8f-e929-7459-9c98-bfacaa626f87" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/BusinessAcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#BusinessAcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/BusinessAcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7971-9113-213898352eff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7971-9113-213898352eff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7971-9113-213898352eff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7971-9113-213898352eff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7971-9113-213898352eff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7b9a-b246-9ed215001d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7971-9113-213898352eff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7b9a-b246-9ed215001d4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d445c-d2fe-71cb-9382-af320e673360" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7b9a-b246-9ed215001d4f" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d445c-d2fe-71cb-9382-af320e673360" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_MonevoLimitedMember_019c8c8f-e929-76cb-976e-aa89a9ca292b" xlink:href="tru-20260331.xsd#tru_MonevoLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7b9a-b246-9ed215001d4f" xlink:to="loc_tru_MonevoLimitedMember_019c8c8f-e929-76cb-976e-aa89a9ca292b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d446c-3457-74c3-873f-187c840d2f4b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d446c-3457-74c3-873f-187c840d2f4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019d446c-3457-74c3-873f-187c840d2f4b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d446c-3457-74c3-873f-187c840d2f4b" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019d446c-3457-74c3-873f-187c840d2f4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019d446c-3457-74b0-8ca7-973e81433542" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d446c-3457-74c3-873f-187c840d2f4b" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019d446c-3457-74b0-8ca7-973e81433542" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d446c-6683-71eb-a80a-79760b94773d" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019d446c-3457-74b0-8ca7-973e81433542" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d446c-6683-71eb-a80a-79760b94773d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019d4487-aee2-7713-925b-8281c27b1da5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:to="loc_srt_OwnershipAxis_019d4487-aee2-7713-925b-8281c27b1da5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019d4487-aee2-7713-925b-8281c27b1da5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019d4487-aee2-7713-925b-8281c27b1da5" xlink:to="loc_srt_OwnershipDomain_019d4487-aee2-7713-925b-8281c27b1da5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019d4487-aee2-79d2-832e-09ae00d247f7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019d4487-aee2-7713-925b-8281c27b1da5" xlink:to="loc_srt_OwnershipDomain_019d4487-aee2-79d2-832e-09ae00d247f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d4487-da69-7051-94d1-14d64f11a658" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019d4487-aee2-79d2-832e-09ae00d247f7" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d4487-da69-7051-94d1-14d64f11a658" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019d9721-5dd5-75c1-934f-af3a6218a078" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7b4b-b80e-b81c2acb4261" xlink:to="loc_dei_LegalEntityAxis_019d9721-5dd5-75c1-934f-af3a6218a078" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019d9721-5dd5-75c1-934f-af3a6218a078_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019d9721-5dd5-75c1-934f-af3a6218a078" xlink:to="loc_dei_EntityDomain_019d9721-5dd5-75c1-934f-af3a6218a078_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019d9721-5dd5-7ad5-95cd-5781cdb4c658" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019d9721-5dd5-75c1-934f-af3a6218a078" xlink:to="loc_dei_EntityDomain_019d9721-5dd5-7ad5-95cd-5781cdb4c658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d9723-5ed8-7d69-8d8d-b0ab8bc26418" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019d9721-5dd5-7ad5-95cd-5781cdb4c658" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d9723-5ed8-7d69-8d8d-b0ab8bc26418" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019c8c8f-e929-7222-b215-d827000177c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019c8c8f-e929-7222-b215-d827000177c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019c8c8f-e929-7123-8fb9-411cc211cd02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019c8c8f-e929-7123-8fb9-411cc211cd02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c8c8f-e929-7709-9b20-07f168eac5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c8c8f-e929-7709-9b20-07f168eac5b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage_019c8c8f-e929-7f5e-ad7c-4ced916cf318" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage_019c8c8f-e929-7f5e-ad7c-4ced916cf318" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_019d4462-819e-7d64-ac3d-50b5daa6c1a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_019d4462-819e-7d64-ac3d-50b5daa6c1a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019d4463-fc2f-721e-9259-2d964617a0d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019d4463-fc2f-721e-9259-2d964617a0d5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019d446b-d4eb-7d0d-9ecb-d3d7acbacf5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019d446b-d4eb-7d0d-9ecb-d3d7acbacf5f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss_019d446d-5337-7c7c-afee-43ed19afccb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss_019d446d-5337-7c7c-afee-43ed19afccb0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019c8c8f-e929-708f-b292-05d3193bc4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019c8c8f-e929-708f-b292-05d3193bc4a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_DividendsPayableIncludedInOtherCurrentLiabilities_019d9722-5496-7b52-8579-e006439c9a24" xlink:href="tru-20260331.xsd#tru_DividendsPayableIncludedInOtherCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_tru_DividendsPayableIncludedInOtherCurrentLiabilities_019d9722-5496-7b52-8579-e006439c9a24" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_DividendsPayableIncludedInOtherLiabilities_019d9722-bf21-75d5-9569-15d831ecf0f8" xlink:href="tru-20260331.xsd#tru_DividendsPayableIncludedInOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_tru_DividendsPayableIncludedInOtherLiabilities_019d9722-bf21-75d5-9569-15d831ecf0f8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_019c8c8f-e929-76b8-add6-a46a65a3cbf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_019c8c8f-e929-76b8-add6-a46a65a3cbf2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c8c8f-e929-7153-a6be-9616f118c39c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_Goodwill_019c8c8f-e929-7153-a6be-9616f118c39c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c8c8f-e929-7d60-8a1c-e345f3e1d78f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c8c8f-e929-7d60-8a1c-e345f3e1d78f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019c8c8f-e929-7ce6-9d6a-2d2507c32584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019c8c8f-e929-7ce6-9d6a-2d2507c32584" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c8c8f-e929-73a4-b394-4f91d1e3fa05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7c1c-be45-69f144c10a11" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c8c8f-e929-73a4-b394-4f91d1e3fa05" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/BusinessAcquisitionsPurchaseConsiderationDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#BusinessAcquisitionsPurchaseConsiderationDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/BusinessAcquisitionsPurchaseConsiderationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d9711-6a47-7a6c-ae18-d4aa4612733d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d9711-6a47-7a6c-ae18-d4aa4612733d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d9711-6a47-76b7-aa6b-5e30ced0b473" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d9711-6a47-7a6c-ae18-d4aa4612733d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d9711-6a47-76b7-aa6b-5e30ced0b473" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d9711-6a47-76b7-aa6b-5e30ced0b473_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d9711-6a47-76b7-aa6b-5e30ced0b473" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d9711-6a47-76b7-aa6b-5e30ced0b473_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d9711-6a47-7eec-a469-329371af669b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d9711-6a47-76b7-aa6b-5e30ced0b473" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d9711-6a47-7eec-a469-329371af669b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d9711-a046-7976-a3ad-909c882cb4d4" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d9711-6a47-7eec-a469-329371af669b" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d9711-a046-7976-a3ad-909c882cb4d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d9711-f22b-701a-a135-51b627773d48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d9711-f22b-701a-a135-51b627773d48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_BusinessCombinationAcquisitionOfLessThan100PercentEquityMethodInvestmentFairValue_019d9716-c589-76e1-905a-85a24eb9222c" xlink:href="tru-20260331.xsd#tru_BusinessCombinationAcquisitionOfLessThan100PercentEquityMethodInvestmentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_tru_BusinessCombinationAcquisitionOfLessThan100PercentEquityMethodInvestmentFairValue_019d9716-c589-76e1-905a-85a24eb9222c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019d9715-d229-70c2-9c62-7438209f142b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019d9715-d229-70c2-9c62-7438209f142b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_BusinessCombinationAcquisitionOfLessThan100PercentSettlementOfPreexistingReceivables_019d9717-522a-77ac-b693-d8ef88ebace3" xlink:href="tru-20260331.xsd#tru_BusinessCombinationAcquisitionOfLessThan100PercentSettlementOfPreexistingReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_tru_BusinessCombinationAcquisitionOfLessThan100PercentSettlementOfPreexistingReceivables_019d9717-522a-77ac-b693-d8ef88ebace3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d9712-4966-75be-91f7-e3418ef6e3bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d9711-6a47-7ddb-bbb8-9d8505c35dbd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d9712-4966-75be-91f7-e3418ef6e3bb" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/BusinessAcquisitionsAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#BusinessAcquisitionsAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/BusinessAcquisitionsAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7bf4-b3d2-5d26ba060c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7bf4-b3d2-5d26ba060c4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7c50-820e-00645dab89d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-7bf4-b3d2-5d26ba060c4b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7c50-820e-00645dab89d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7c50-820e-00645dab89d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7c50-820e-00645dab89d7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7c50-820e-00645dab89d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7d28-b328-afb2d6c65727" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7c50-820e-00645dab89d7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7d28-b328-afb2d6c65727" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d4472-9443-7af5-9caa-ed4add645576" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7d28-b328-afb2d6c65727" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d4472-9443-7af5-9caa-ed4add645576" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c8c8f-e929-7945-a94f-312bff5ab343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c8c8f-e929-7945-a94f-312bff5ab343" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019c8c8f-e929-7659-bb3d-df0456d692c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019c8c8f-e929-7659-bb3d-df0456d692c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019c8c8f-e929-7e80-871e-66f170510e27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019c8c8f-e929-7e80-871e-66f170510e27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_019c8c8f-e929-7a9a-a906-cc82fb915e84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_019c8c8f-e929-7a9a-a906-cc82fb915e84" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c8c8f-e929-7bc4-8c1f-fad98f113235" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c8c8f-e929-7bc4-8c1f-fad98f113235" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c8c8f-e929-703d-b44b-e8832e619e35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c8c8f-e929-703d-b44b-e8832e619e35" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019c8c8f-e929-7435-adc3-639dd6ae5e78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019c8c8f-e929-7435-adc3-639dd6ae5e78" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019c8c8f-e929-7543-95a2-e237d525727f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019c8c8f-e929-7543-95a2-e237d525727f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019c8c8f-e929-7537-8c6a-542c47d0adc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019c8c8f-e929-7537-8c6a-542c47d0adc2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019c8c8f-e929-72b4-91dd-4ffe929b51b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019c8c8f-e929-72b4-91dd-4ffe929b51b9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019c8c8f-e929-79b8-8d38-914f553936bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019c8c8f-e929-79b8-8d38-914f553936bd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019c8c8f-e929-710c-8ecf-5c21802d0ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019c8c8f-e929-710c-8ecf-5c21802d0ee1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019c8c8f-e929-7a57-8bda-bbb8b075d50a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019c8c8f-e929-7a57-8bda-bbb8b075d50a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019c8c8f-e929-791f-bece-ee1e831a9808" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019c8c8f-e929-791f-bece-ee1e831a9808" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c8c8f-e929-7069-8435-3f61bdfa3b62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c8c8f-e929-7069-8435-3f61bdfa3b62" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c8c8f-e929-7168-a7e2-d36df9bc5fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_Goodwill_019c8c8f-e929-7168-a7e2-d36df9bc5fc1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019dabea-cd34-7611-8519-d239e96c85fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019dabea-cd34-7611-8519-d239e96c85fb" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019d4478-36be-782c-975a-c7746e32a954" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019d4478-36be-782c-975a-c7746e32a954" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest_019d4478-735c-7b73-874f-95fb9aad63ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7d79-b3e3-6cb012948eb3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest_019d4478-735c-7b73-874f-95fb9aad63ac" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/BusinessAcquisitionsIdentifiableIntangibleAssetsDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#BusinessAcquisitionsIdentifiableIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/BusinessAcquisitionsIdentifiableIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7b38-b60d-caadc9a79237" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-778b-84cc-24c6a3e8b0fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7b38-b60d-caadc9a79237" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-778b-84cc-24c6a3e8b0fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7ced-b168-68b9e165f414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-778b-84cc-24c6a3e8b0fa" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7ced-b168-68b9e165f414" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7ced-b168-68b9e165f414_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7ced-b168-68b9e165f414" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7ced-b168-68b9e165f414_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7dd4-aa93-35913b8d91e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8c8f-e929-7ced-b168-68b9e165f414" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7dd4-aa93-35913b8d91e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d447b-c194-7d53-ac63-b272b55e6949" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8c8f-e929-7dd4-aa93-35913b8d91e0" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d447b-c194-7d53-ac63-b272b55e6949" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7ef7-b8b6-2037a466d153" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c8c8f-e929-778b-84cc-24c6a3e8b0fa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7ef7-b8b6-2037a466d153" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7ef7-b8b6-2037a466d153_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7ef7-b8b6-2037a466d153" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7ef7-b8b6-2037a466d153_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7ef7-b8b6-2037a466d153" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_019c8c8f-e929-7884-b858-540180b071ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_019c8c8f-e929-7884-b858-540180b071ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DatabasesMember_019d44c2-32ab-7fcd-8d4e-af50c0560f49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DatabasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:to="loc_us-gaap_DatabasesMember_019d44c2-32ab-7fcd-8d4e-af50c0560f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_019d447d-0bf5-7ea4-b8f2-798ffb0ce7df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:to="loc_us-gaap_IntellectualPropertyMember_019d447d-0bf5-7ea4-b8f2-798ffb0ce7df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ReacquiredRightsMember_019d447d-7743-7e64-9bf1-f88f67102792" xlink:href="tru-20260331.xsd#tru_ReacquiredRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7981-be33-8c2a0fcfe993" xlink:to="loc_tru_ReacquiredRightsMember_019d447d-7743-7e64-9bf1-f88f67102792" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019c8c8f-e929-7c02-9ec9-0d15a808b90b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7b38-b60d-caadc9a79237" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019c8c8f-e929-7c02-9ec9-0d15a808b90b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c8c8f-e929-70af-ae53-fd344ea9135c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c8c8f-e929-7b38-b60d-caadc9a79237" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c8c8f-e929-70af-ae53-fd344ea9135c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/BusinessAcquisitionsProFormaDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#BusinessAcquisitionsProFormaDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/BusinessAcquisitionsProFormaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019d447f-51b3-7bd1-b725-272be17555a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d447f-51b3-7e52-81ee-9dd69b9173b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d447f-51b3-7bd1-b725-272be17555a6" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d447f-51b3-7e52-81ee-9dd69b9173b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d447f-51b3-7a7d-bc28-8a9547a083b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d447f-51b3-7e52-81ee-9dd69b9173b4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d447f-51b3-7a7d-bc28-8a9547a083b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d447f-51b3-7a7d-bc28-8a9547a083b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d447f-51b3-7a7d-bc28-8a9547a083b8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d447f-51b3-7a7d-bc28-8a9547a083b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d447f-51b3-7696-9f2a-d0f148ef3955" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d447f-51b3-7a7d-bc28-8a9547a083b8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d447f-51b3-7696-9f2a-d0f148ef3955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d447f-8508-7bb2-88d6-225ff21894e7" xlink:href="tru-20260331.xsd#tru_TransUnionDeMexicoS.A.S.I.C.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d447f-51b3-7696-9f2a-d0f148ef3955" xlink:to="loc_tru_TransUnionDeMexicoS.A.S.I.C.Member_019d447f-8508-7bb2-88d6-225ff21894e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019d447f-51b3-743e-83e0-7cbd7bb15ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d447f-51b3-7bd1-b725-272be17555a6" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019d447f-51b3-743e-83e0-7cbd7bb15ebc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019d447f-51b3-733c-baa2-1ed677f29162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d447f-51b3-7bd1-b725-272be17555a6" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019d447f-51b3-733c-baa2-1ed677f29162" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/GoodwillChangesinGoodwillDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#GoodwillChangesinGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/GoodwillChangesinGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-7edf-a765-a9a8d0d9617a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-7130-8829-fc47a6500886" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-7edf-a765-a9a8d0d9617a" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-7130-8829-fc47a6500886" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-7130-8829-fc47a6500886" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e929-7830-965b-ee4b2688df3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7ec1-bd23-2f2f3a1b01a3" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e929-7830-965b-ee4b2688df3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_USMarketsMember_019c8c8f-e929-7d1c-a161-3e8799ae7d94" xlink:href="tru-20260331.xsd#tru_USMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e929-7830-965b-ee4b2688df3a" xlink:to="loc_tru_USMarketsMember_019c8c8f-e929-7d1c-a161-3e8799ae7d94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternationalMember_019c8c8f-e929-7ea3-b2f4-0d5a98f562d9" xlink:href="tru-20260331.xsd#tru_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e929-7830-965b-ee4b2688df3a" xlink:to="loc_tru_InternationalMember_019c8c8f-e929-7ea3-b2f4-0d5a98f562d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-7edf-a765-a9a8d0d9617a" xlink:to="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c8c8f-e929-701e-bfc0-d3c7cdc1925a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:to="loc_us-gaap_Goodwill_019c8c8f-e929-701e-bfc0-d3c7cdc1925a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019c8c8f-e929-7228-a551-6f8f21f7d66a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019c8c8f-e929-7228-a551-6f8f21f7d66a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019d972f-6d27-7d33-b080-076768b28e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019d972f-6d27-7d33-b080-076768b28e4b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019c8c8f-e929-76f7-8488-8fe23c7dc9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c8c8f-e929-76ef-9801-8c34e49e24bf" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019c8c8f-e929-76f7-8488-8fe23c7dc9f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c8c8f-e929-7b4b-ae69-7024d2319aff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/GoodwillGrossandNetGoodwillBalancesDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#GoodwillGrossandNetGoodwillBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/GoodwillGrossandNetGoodwillBalancesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-74dc-9591-27ff47d94ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-72d6-afd2-51f16b849b57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-74dc-9591-27ff47d94ff6" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-72d6-afd2-51f16b849b57" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7c70-99ad-6cb149f9f863" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019c8c8f-e929-72d6-afd2-51f16b849b57" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7c70-99ad-6cb149f9f863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e929-7c70-99ad-6cb149f9f863_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7c70-99ad-6cb149f9f863" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e929-7c70-99ad-6cb149f9f863_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e929-7cbe-8fc8-6c4040f953ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e929-7c70-99ad-6cb149f9f863" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e929-7cbe-8fc8-6c4040f953ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_USMarketsMember_019c8c8f-e929-76bf-9e4a-281b012f4245" xlink:href="tru-20260331.xsd#tru_USMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e929-7cbe-8fc8-6c4040f953ab" xlink:to="loc_tru_USMarketsMember_019c8c8f-e929-76bf-9e4a-281b012f4245" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternationalMember_019c8c8f-e929-7d4b-9e0b-7177d13094ae" xlink:href="tru-20260331.xsd#tru_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e929-7cbe-8fc8-6c4040f953ab" xlink:to="loc_tru_InternationalMember_019c8c8f-e929-7d4b-9e0b-7177d13094ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_019c8c8f-e929-7ff5-8753-eac18a99a34c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-74dc-9591-27ff47d94ff6" xlink:to="loc_us-gaap_GoodwillGross_019c8c8f-e929-7ff5-8753-eac18a99a34c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_019c8c8f-e929-714e-b00e-efd7bf38382a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-74dc-9591-27ff47d94ff6" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_019c8c8f-e929-714e-b00e-efd7bf38382a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c8c8f-e929-7724-aabc-13ed1cdf36f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c8c8f-e929-74dc-9591-27ff47d94ff6" xlink:to="loc_us-gaap_Goodwill_019c8c8f-e929-7724-aabc-13ed1cdf36f3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/IntangibleAssetsSummaryDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#IntangibleAssetsSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/IntangibleAssetsSummaryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e929-7991-b12b-31f40fcd3043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-7704-b853-920563fe19cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e929-7991-b12b-31f40fcd3043" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-7704-b853-920563fe19cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7d16-b49e-1302637cf1c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-7704-b853-920563fe19cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7d16-b49e-1302637cf1c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7d16-b49e-1302637cf1c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7d16-b49e-1302637cf1c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7d16-b49e-1302637cf1c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-7d16-b49e-1302637cf1c2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019c8c8f-e929-7fb3-89c5-f384ffa7ae89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019c8c8f-e929-7fb3-89c5-f384ffa7ae89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternalUseSoftwareMember_019c8c8f-e929-7cc8-8f15-ec390d501e79" xlink:href="tru-20260331.xsd#tru_InternalUseSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_tru_InternalUseSoftwareMember_019c8c8f-e929-7cc8-8f15-ec390d501e79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DatabasesMember_019c8c8f-e929-7a14-b5d8-6572f6d9f195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DatabasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_us-gaap_DatabasesMember_019c8c8f-e929-7a14-b5d8-6572f6d9f195" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_019c8c8f-e929-7789-9499-90067fd367e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_us-gaap_TrademarksMember_019c8c8f-e929-7789-9499-90067fd367e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_019c8c8f-e929-7fb0-ba91-e01245a63bff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_019c8c8f-e929-7fb0-ba91-e01245a63bff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ReacquiredRightsMember_019d44c1-c0a9-7b67-8681-476540827d96" xlink:href="tru-20260331.xsd#tru_ReacquiredRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-721a-864e-fe43310c3c75" xlink:to="loc_tru_ReacquiredRightsMember_019d44c1-c0a9-7b67-8681-476540827d96" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c8c8f-e929-725e-ac52-6ae1d30af2e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e929-7991-b12b-31f40fcd3043" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c8c8f-e929-725e-ac52-6ae1d30af2e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c8c8f-e929-7dd7-b315-957f5f7399e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e929-7991-b12b-31f40fcd3043" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c8c8f-e929-7dd7-b315-957f5f7399e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c8c8f-e929-7eb9-b177-4ccb9bf4edfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e929-7991-b12b-31f40fcd3043" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c8c8f-e929-7eb9-b177-4ccb9bf4edfb" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/IntangibleAssetsChangesinCarryingAmountDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#IntangibleAssetsChangesinCarryingAmountDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/IntangibleAssetsChangesinCarryingAmountDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e9d4-7f9f-96c9-e9e94cfc1b68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-798d-b96e-7c51d3902024" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e9d4-7f9f-96c9-e9e94cfc1b68" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-798d-b96e-7c51d3902024" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-76f3-9baa-69edec2a6dab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019c8c8f-e929-798d-b96e-7c51d3902024" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-76f3-9baa-69edec2a6dab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-76f3-9baa-69edec2a6dab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-76f3-9baa-69edec2a6dab" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-76f3-9baa-69edec2a6dab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c8c8f-e929-76f3-9baa-69edec2a6dab" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_019c8c8f-e929-7fcd-a6f3-2fd3acb0d18f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_019c8c8f-e929-7fcd-a6f3-2fd3acb0d18f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AmortizationMember_019c8c8f-e929-70bc-9e3e-7967c8e4997e" xlink:href="tru-20260331.xsd#tru_AmortizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:to="loc_tru_AmortizationMember_019c8c8f-e929-70bc-9e3e-7967c8e4997e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_019c8c8f-e929-7705-8b40-9933f69dda74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_019c8c8f-e929-7705-8b40-9933f69dda74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_FXTransalationMember_019c8c8f-e9d4-73f3-b359-1f7d58eccfbf" xlink:href="tru-20260331.xsd#tru_FXTransalationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:to="loc_tru_FXTransalationMember_019c8c8f-e9d4-73f3-b359-1f7d58eccfbf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_BusinessAcquisitionsMember_019c8c8f-e9d4-7cfc-b409-f1b1baa6deaf" xlink:href="tru-20260331.xsd#tru_BusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c8c8f-e929-7e0c-aabf-074b869a5358" xlink:to="loc_tru_BusinessAcquisitionsMember_019c8c8f-e9d4-7cfc-b409-f1b1baa6deaf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019c8c8f-e9d4-7f9f-96c9-e9e94cfc1b68" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c8c8f-e9d4-7495-b7db-8a81a3224ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c8c8f-e9d4-7495-b7db-8a81a3224ffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_019c8c8f-e9d4-74e4-aeff-3769c41b7bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_019c8c8f-e9d4-74e4-aeff-3769c41b7bb8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019c8c8f-e9d4-7b64-a31a-b5b9f7ca485d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c8c8f-e9d4-76d7-8c91-2adaa2fd1e06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c8c8f-e9d4-76d7-8c91-2adaa2fd1e06" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_FiniteLivedIntangibleAssetsAccumulatedAmortizationIncreaseDecrease_019c8c8f-e9d4-7ccd-8c43-b506bf8b3faf" xlink:href="tru-20260331.xsd#tru_FiniteLivedIntangibleAssetsAccumulatedAmortizationIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_tru_FiniteLivedIntangibleAssetsAccumulatedAmortizationIncreaseDecrease_019c8c8f-e9d4-7ccd-8c43-b506bf8b3faf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019c8c8f-e9d4-787d-918a-0e03053d3dff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c8c8f-e9d4-7037-9f23-846f47dfb981" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c8c8f-e9d4-7037-9f23-846f47dfb981" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_FiniteLivedIntangibleAssetsIncreaseDecreaseNet_019c8c8f-e9d4-7405-a162-740cb29e7e27" xlink:href="tru-20260331.xsd#tru_FiniteLivedIntangibleAssetsIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019c8c8f-e9d4-7313-8e95-c170a4e911e4" xlink:to="loc_tru_FiniteLivedIntangibleAssetsIncreaseDecreaseNet_019c8c8f-e9d4-7405-a162-740cb29e7e27" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019c8c8f-e9d4-7f2e-8e1c-c1e166eeea80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/DebtOutstandingDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#DebtOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/DebtOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7aae-b474-28d53be3dfa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7aae-b474-28d53be3dfa5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-75c3-b486-a57cba551334" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7aae-b474-28d53be3dfa5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-75c3-b486-a57cba551334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-75c3-b486-a57cba551334_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-75c3-b486-a57cba551334" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-75c3-b486-a57cba551334_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-75c3-b486-a57cba551334" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7af3-b77d-3af0e7fef3d9" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB5Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:to="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7af3-b77d-3af0e7fef3d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7654-82a3-6ebf3afaeb13" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:to="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7654-82a3-6ebf3afaeb13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-7ce7-801f-d7d713be157b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-7ce7-801f-d7d713be157b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-7688-8266-ab536debc870" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanA4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:to="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-7688-8266-ab536debc870" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-7050-90ff-5dbcd2f430e2" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7385-9bc4-bb529bf86063" xlink:to="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-7050-90ff-5dbcd2f430e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7aae-b474-28d53be3dfa5" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7b7b-bfb1-c752e2b97208" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-71ed-9e8d-5c461c5145e9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7b7b-bfb1-c752e2b97208" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8c8f-e9d5-79ea-997b-0bc55056994a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7b7b-bfb1-c752e2b97208" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8c8f-e9d5-79ea-997b-0bc55056994a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_A2021InterestRateSwapMember_019c8c8f-e9d5-79d5-b637-1205bc38d418" xlink:href="tru-20260331.xsd#tru_A2021InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7b7b-bfb1-c752e2b97208" xlink:to="loc_tru_A2021InterestRateSwapMember_019c8c8f-e9d5-79d5-b637-1205bc38d418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c8c8f-e9d5-77e7-8753-636acfaad52c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7aae-b474-28d53be3dfa5" xlink:to="loc_srt_RangeAxis_019c8c8f-e9d5-77e7-8753-636acfaad52c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-77e7-8753-636acfaad52c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-77e7-8753-636acfaad52c" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-77e7-8753-636acfaad52c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-76af-9d43-a57af4bdf171" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-77e7-8753-636acfaad52c" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-76af-9d43-a57af4bdf171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c8c8f-e9d5-775c-904c-dad3a18dcc36" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8c8f-e9d5-76af-9d43-a57af4bdf171" xlink:to="loc_srt_MinimumMember_019c8c8f-e9d5-775c-904c-dad3a18dcc36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c8c8f-e9d5-7e1a-8271-96c5b6b3c9bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8c8f-e9d5-76af-9d43-a57af4bdf171" xlink:to="loc_srt_MaximumMember_019c8c8f-e9d5-7e1a-8271-96c5b6b3c9bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8c8f-e9d5-7b76-9fc9-c115f63dcf52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8c8f-e9d5-7b76-9fc9-c115f63dcf52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019c8c8f-e9d5-76e5-b66c-2fc864b70c85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_OtherLongTermDebt_019c8c8f-e9d5-76e5-b66c-2fc864b70c85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_019c8c8f-e9d5-7650-9504-029a3b6112d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtCurrent_019c8c8f-e9d5-7650-9504-029a3b6112d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019c8c8f-e9d5-7e83-b06b-4efc358f53ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019c8c8f-e9d5-7e83-b06b-4efc358f53ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_019c8c8f-e9d5-75ef-8be9-cc110535edfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_019c8c8f-e9d5-75ef-8be9-cc110535edfe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_019c8c8f-e9d5-7c2d-82d7-49a398373993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtPercentageBearingVariableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_019c8c8f-e9d5-7c2d-82d7-49a398373993" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_019c8c8f-e9d5-735d-963a-a1ca04c9b4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_019c8c8f-e9d5-735d-963a-a1ca04c9b4b3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_019c8c8f-e9d5-70f8-93b1-b0a517cb86c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_019c8c8f-e9d5-70f8-93b1-b0a517cb86c1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_019c8c8f-e9d5-778c-b676-543a64afda0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_019c8c8f-e9d5-778c-b676-543a64afda0c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019c8c8f-e9d5-7402-9468-e1425c831292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019c8c8f-e9d5-7402-9468-e1425c831292" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c8c8f-e9d5-77b0-875f-50c76b959e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c8c8f-e9d5-77b0-875f-50c76b959e2d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_019c8c8f-e9d5-7d0f-9998-c9dd10f712fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_019c8c8f-e9d5-7d0f-9998-c9dd10f712fc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c8c8f-e9d5-7f23-ab3c-c30adb100312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c8c8f-e9d5-7f23-ab3c-c30adb100312" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-7954-af50-7f65f5130fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-710f-bc09-b9782c8f63b7" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-7954-af50-7f65f5130fa4" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c8c8f-e9d5-7008-a11c-86bc988fe9d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:to="loc_us-gaap_CreditFacilityAxis_019c8c8f-e9d5-7008-a11c-86bc988fe9d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8c8f-e9d5-7008-a11c-86bc988fe9d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8c8f-e9d5-7008-a11c-86bc988fe9d3" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8c8f-e9d5-7008-a11c-86bc988fe9d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8c8f-e9d5-71b1-b9a7-f67f8d2a7e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8c8f-e9d5-7008-a11c-86bc988fe9d3" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8c8f-e9d5-71b1-b9a7-f67f8d2a7e88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-728e-8aa6-1fddfc879b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c8c8f-e9d5-71b1-b9a7-f67f8d2a7e88" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-728e-8aa6-1fddfc879b7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-722f-8497-60276f7e603d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-722f-8497-60276f7e603d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-722f-8497-60276f7e603d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-722f-8497-60276f7e603d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-722f-8497-60276f7e603d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-722f-8497-60276f7e603d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-7afe-bed6-69246e9c4278" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8c8f-e9d5-7afe-bed6-69246e9c4278" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7b0d-a3e1-0c45a349c70d" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB5Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7b0d-a3e1-0c45a349c70d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-73ae-bd90-735a13108b62" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanA4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-73ae-bd90-735a13108b62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7a99-bc77-baacca6037af" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7a99-bc77-baacca6037af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-7a2c-8dcb-afacb3876136" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-7a2c-8dcb-afacb3876136" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanMember_019d44b7-078e-7c5b-a04e-8922eecd8e0d" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71bb-998c-6a2b8e27d9fa" xlink:to="loc_tru_SeniorSecuredTermLoanMember_019d44b7-078e-7c5b-a04e-8922eecd8e0d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-7126-8635-90222777e92c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-7126-8635-90222777e92c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7126-8635-90222777e92c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-7126-8635-90222777e92c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-7126-8635-90222777e92c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-70aa-a621-c481333b052a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8c8f-e9d5-7126-8635-90222777e92c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-70aa-a621-c481333b052a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_A2024InterestRateSwapMember_019c8c8f-e9d5-797e-a004-4df0db2974fd" xlink:href="tru-20260331.xsd#tru_A2024InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-70aa-a621-c481333b052a" xlink:to="loc_tru_A2024InterestRateSwapMember_019c8c8f-e9d5-797e-a004-4df0db2974fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8c8f-e9d5-7284-a398-75a3361e952a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-70aa-a621-c481333b052a" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8c8f-e9d5-7284-a398-75a3361e952a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_A2025InterestRateSwapMember_019c8c8f-e9d5-79e4-9416-47f15bd02591" xlink:href="tru-20260331.xsd#tru_A2025InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8c8f-e9d5-70aa-a621-c481333b052a" xlink:to="loc_tru_A2025InterestRateSwapMember_019c8c8f-e9d5-79e4-9416-47f15bd02591" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-782f-92b0-340b7d6c457c" xlink:to="loc_srt_RangeAxis_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-7eb2-9abf-97a2171c9339" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-7f14-8b34-6a458d61dcb9" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-7eb2-9abf-97a2171c9339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c8c8f-e9d5-76ce-a0fb-2020df345492" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8c8f-e9d5-7eb2-9abf-97a2171c9339" xlink:to="loc_srt_MinimumMember_019c8c8f-e9d5-76ce-a0fb-2020df345492" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c8c8f-e9d5-7f42-909f-1d09a47cc2ec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8c8f-e9d5-7eb2-9abf-97a2171c9339" xlink:to="loc_srt_MaximumMember_019c8c8f-e9d5-7f42-909f-1d09a47cc2ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d44b3-de3f-74ef-a778-9e8e824aab09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d44b3-de3f-74ef-a778-9e8e824aab09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019c8c8f-e9d5-7e7d-9d26-885a0dac8ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019c8c8f-e9d5-7e7d-9d26-885a0dac8ecd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8c8f-e9d5-729c-8c8a-cac9bc2d333a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8c8f-e9d5-729c-8c8a-cac9bc2d333a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019c8c8f-e9d5-7833-ac6e-5b7befb789ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019c8c8f-e9d5-7833-ac6e-5b7befb789ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c8c8f-e9d5-76fe-af81-1f4994ee36da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c8c8f-e9d5-76fe-af81-1f4994ee36da" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_IncrementalBorrowingsAmount_019c8c8f-e9d5-7edc-863c-87275ebedae2" xlink:href="tru-20260331.xsd#tru_IncrementalBorrowingsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_IncrementalBorrowingsAmount_019c8c8f-e9d5-7edc-863c-87275ebedae2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_IncrementalBorrowingsCriteriaPercentageofConsolidatedEBITDA_019c8c8f-e9d5-7da2-81b7-d7383abd7df6" xlink:href="tru-20260331.xsd#tru_IncrementalBorrowingsCriteriaPercentageofConsolidatedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_IncrementalBorrowingsCriteriaPercentageofConsolidatedEBITDA_019c8c8f-e9d5-7da2-81b7-d7383abd7df6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_IncrementalBorrowingsCriteriaSeniorSecuredLeverageratio_019c8c8f-e9d5-7e11-bb60-f09fea55ece8" xlink:href="tru-20260331.xsd#tru_IncrementalBorrowingsCriteriaSeniorSecuredLeverageratio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_IncrementalBorrowingsCriteriaSeniorSecuredLeverageratio_019c8c8f-e9d5-7e11-bb60-f09fea55ece8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_NetLeverageRatioRequirement_019c8c8f-e9d5-7b69-a8e5-528b5b866d42" xlink:href="tru-20260331.xsd#tru_NetLeverageRatioRequirement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_NetLeverageRatioRequirement_019c8c8f-e9d5-7b69-a8e5-528b5b866d42" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_CovenantDividendRestrictionAmount_019c8c8f-e9d5-7893-9478-9e00d947efcf" xlink:href="tru-20260331.xsd#tru_CovenantDividendRestrictionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_CovenantDividendRestrictionAmount_019c8c8f-e9d5-7893-9478-9e00d947efcf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_CovenantDividendRestrictionPercentageofConsolidatedEBITDA_019c8c8f-e9d5-7cec-a63e-02563048729a" xlink:href="tru-20260331.xsd#tru_CovenantDividendRestrictionPercentageofConsolidatedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_CovenantDividendRestrictionPercentageofConsolidatedEBITDA_019c8c8f-e9d5-7cec-a63e-02563048729a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_NetLeverageRatioRequirementDividends_019c8c8f-e9d5-7997-a151-47316db8ca23" xlink:href="tru-20260331.xsd#tru_NetLeverageRatioRequirementDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_tru_NetLeverageRatioRequirementDividends_019c8c8f-e9d5-7997-a151-47316db8ca23" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c8c8f-e9d5-7f8c-b7c1-e0690bbc744a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c8c8f-e9d5-7f8c-b7c1-e0690bbc744a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_019c8c8f-e9d5-7040-b262-53eea0e92f29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_019c8c8f-e9d5-7040-b262-53eea0e92f29" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_019c8c8f-e9d5-7396-9087-92008e55d929" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_019c8c8f-e9d5-7396-9087-92008e55d929" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019c8c8f-e9d5-763f-a5c6-3698142959d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019c8c8f-e9d5-763f-a5c6-3698142959d4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c8c8f-e9d5-7322-99f2-b52ad79b6a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c8c8f-e9d5-7322-99f2-b52ad79b6a3a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-73c1-92fa-48aca18f084f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019c8c8f-e9d5-70ee-afbe-9cd2ab9438aa" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-73c1-92fa-48aca18f084f" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/DebtFairValueDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#DebtFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/DebtFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-7803-9f01-5e6e2346fb96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-7803-9f01-5e6e2346fb96" xlink:to="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-756b-abf2-d797a86f96ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-756b-abf2-d797a86f96ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-756b-abf2-d797a86f96ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-756b-abf2-d797a86f96ba" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-756b-abf2-d797a86f96ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-756b-abf2-d797a86f96ba" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7236-b9e3-b721b0eb06ee" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB5Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:to="loc_tru_SeniorSecuredTermLoanB5Member_019c8c8f-e9d5-7236-b9e3-b721b0eb06ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-73cc-9d50-cd87d4522ed3" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanA4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:to="loc_tru_SeniorSecuredTermLoanA4Member_019c8c8f-e9d5-73cc-9d50-cd87d4522ed3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-77b1-9410-1652a06ee072" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:to="loc_tru_SeniorSecuredTermLoanB8Member_019c8c8f-e9d5-77b1-9410-1652a06ee072" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7849-aeb1-22edd6b4dbd2" xlink:href="tru-20260331.xsd#tru_SeniorSecuredTermLoanB9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7195-9b7d-5be2ce5323fa" xlink:to="loc_tru_SeniorSecuredTermLoanB9Member_019c8c8f-e9d5-7849-aeb1-22edd6b4dbd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c8c8f-e9d5-718e-818d-a1c78d6c6c48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c8c8f-e9d5-718e-818d-a1c78d6c6c48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c8c8f-e9d5-718e-818d-a1c78d6c6c48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c8c8f-e9d5-718e-818d-a1c78d6c6c48" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c8c8f-e9d5-718e-818d-a1c78d6c6c48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c8c8f-e9d5-7284-95d9-64d87e474bb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c8c8f-e9d5-718e-818d-a1c78d6c6c48" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c8c8f-e9d5-7284-95d9-64d87e474bb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:to="loc_us-gaap_VariableRateAxis_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e" xlink:to="loc_us-gaap_VariableRateDomain_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019c8c8f-e9d5-7372-80b5-2963d6af5ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019c8c8f-e9d5-7aef-b3a0-d0ca8c42392e" xlink:to="loc_us-gaap_VariableRateDomain_019c8c8f-e9d5-7372-80b5-2963d6af5ddc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8c8f-e9d5-7600-9d07-c7308836d22f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8c8f-e9d5-7600-9d07-c7308836d22f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8c8f-e9d5-7600-9d07-c7308836d22f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8c8f-e9d5-7600-9d07-c7308836d22f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8c8f-e9d5-7600-9d07-c7308836d22f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8c8f-e9d5-768d-bacb-f36023cdca2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8c8f-e9d5-7600-9d07-c7308836d22f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8c8f-e9d5-768d-bacb-f36023cdca2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8c8f-e9d5-7e46-bc15-acdaf60a8652" xlink:to="loc_srt_RangeAxis_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8c8f-e9d5-7752-a58b-9850e7723952" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c8c8f-e9d5-7464-9ebe-6212e3f0dd7e" xlink:to="loc_srt_RangeMember_019c8c8f-e9d5-7752-a58b-9850e7723952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-76b7-9c20-e3fe4b4f95e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8c8f-e9d5-7803-9f01-5e6e2346fb96" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019c8c8f-e9d5-76b7-9c20-e3fe4b4f95e1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/RevenueDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c8c8f-e9d5-7b1e-9193-3bd8938051e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c8c8f-e9d5-7b1e-9193-3bd8938051e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c8c8f-e9d5-7879-81dd-66a05fc8d97e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c8c8f-e9d5-7b1e-9193-3bd8938051e5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c8c8f-e9d5-7879-81dd-66a05fc8d97e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuePerformanceObligationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:to="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c8c8f-e9d5-7cd1-b06c-2b8bc218a6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c8c8f-e9d5-7cd1-b06c-2b8bc218a6f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c8c8f-e9d5-778f-bf29-9d26b7b00e73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c8c8f-e9d5-778f-bf29-9d26b7b00e73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod_019c8c8f-e9d5-7b03-9218-361286edb909" xlink:href="tru-20260331.xsd#tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod_019c8c8f-e9d5-7b03-9218-361286edb909" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019c8c8f-e9d5-7f3e-817f-c6cc37b1906f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019c8c8f-e9d5-7f3e-817f-c6cc37b1906f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/RevenueDetails_1" xlink:type="simple" xlink:href="tru-20260331.xsd#RevenueDetails_1"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/RevenueDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c8c8f-e9d5-7b1e-9193-3bd8938051e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c8c8f-e9d5-7b1e-9193-3bd8938051e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuePerformanceObligationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8c8f-e9d5-7707-af4f-6d2492edaf73" xlink:to="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c8c8f-e9d5-7cd1-b06c-2b8bc218a6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c8c8f-e9d5-7cd1-b06c-2b8bc218a6f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c8c8f-e9d5-778f-bf29-9d26b7b00e73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c8c8f-e9d5-778f-bf29-9d26b7b00e73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod_019c8c8f-e9d5-7b03-9218-361286edb909" xlink:href="tru-20260331.xsd#tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_tru_ContractWithCustomerLiabilityNoncurrentRecognitionPeriod_019c8c8f-e9d5-7b03-9218-361286edb909" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019c8c8f-e9d5-7f3e-817f-c6cc37b1906f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuePerformanceObligationAbstract_019c8c8f-e9d5-71a5-947f-2b6ccd1c8f44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019c8c8f-e9d5-7f3e-817f-c6cc37b1906f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/IncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_019c8c8f-e9d5-71bd-896b-2a74b7f9c7a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_019c8c8f-e9d5-71bd-896b-2a74b7f9c7a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_019c8c8f-e9d5-71bd-896b-2a74b7f9c7a4" xlink:to="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd" xlink:to="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-730f-b39e-9e70b42919b2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-7844-9ca5-6834d1e1dacd" xlink:to="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-730f-b39e-9e70b42919b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019c8c8f-e9d5-748c-b8e9-cdfb339951cc" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-730f-b39e-9e70b42919b2" xlink:to="loc_country_GB_019c8c8f-e9d5-748c-b8e9-cdfb339951cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c8c8f-e9d5-7f7b-a1b5-68f0b63dcf26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c8c8f-e9d5-7f7b-a1b5-68f0b63dcf26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_019c8c8f-e9d5-7537-8d41-664c749d2932" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_019c8c8f-e9d5-7537-8d41-664c749d2932" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019c8c8f-e9d5-7f34-bed4-b30805a0dea7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019c8c8f-e9d5-7f34-bed4-b30805a0dea7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_019c8c8f-e9d5-7491-91b3-f06d2c3d0129" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_019c8c8f-e9d5-7491-91b3-f06d2c3d0129" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c8c8f-e9d5-7817-915a-da6dfad63d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c8c8f-e9d5-7515-9fa3-fc1bfe9dde84" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c8c8f-e9d5-7817-915a-da6dfad63d9d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/FairValueDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#FairValueDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/FairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8c8f-e9d5-7de3-adf1-68af23b8eb39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8c8f-e9d5-7de3-adf1-68af23b8eb39" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8c8f-e9d5-7aa2-ad36-6375a9916093" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8c8f-e9d5-7aa2-ad36-6375a9916093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8c8f-e9d5-7aa2-ad36-6375a9916093_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8c8f-e9d5-7aa2-ad36-6375a9916093" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8c8f-e9d5-7aa2-ad36-6375a9916093_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8c8f-e9d5-76a1-a28c-1e393a7c5026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8c8f-e9d5-7aa2-ad36-6375a9916093" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8c8f-e9d5-76a1-a28c-1e393a7c5026" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8c8f-e9d5-7bc3-850c-298ec34a8d06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8c8f-e9d5-76a1-a28c-1e393a7c5026" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8c8f-e9d5-7bc3-850c-298ec34a8d06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8c8f-e9d5-76a0-8a9a-772f846d2c96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8c8f-e9d5-76a0-8a9a-772f846d2c96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-76a0-8a9a-772f846d2c96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8c8f-e9d5-76a0-8a9a-772f846d2c96" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-76a0-8a9a-772f846d2c96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-7379-ac84-704fbe789e08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8c8f-e9d5-76a0-8a9a-772f846d2c96" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-7379-ac84-704fbe789e08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c8c8f-e9d5-7b16-a73c-0c08ce109163" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-7379-ac84-704fbe789e08" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c8c8f-e9d5-7b16-a73c-0c08ce109163" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c8c8f-e9d5-772b-b027-b49a30148748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-7379-ac84-704fbe789e08" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c8c8f-e9d5-772b-b027-b49a30148748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c8c8f-e9d5-7e5c-a0e8-acbe1471bcf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8c8f-e9d5-7379-ac84-704fbe789e08" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c8c8f-e9d5-7e5c-a0e8-acbe1471bcf8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-71f4-8433-53e5eaa8e010" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-71f4-8433-53e5eaa8e010" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71f4-8433-53e5eaa8e010_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-71f4-8433-53e5eaa8e010" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-71f4-8433-53e5eaa8e010_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7dc6-8729-eb8f94988991" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8c8f-e9d5-71f4-8433-53e5eaa8e010" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7dc6-8729-eb8f94988991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019c8c8f-e9d5-7e5c-af0a-0f36a3a425a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8c8f-e9d5-7dc6-8729-eb8f94988991" xlink:to="loc_us-gaap_ConvertibleDebtMember_019c8c8f-e9d5-7e5c-af0a-0f36a3a425a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019d44bd-2f6c-7621-8978-564fca75f6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c8c8f-e9d5-7c20-a189-a08d0c76778e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019d44bd-2f6c-7621-8978-564fca75f6d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019d44bd-2f6c-7621-8978-564fca75f6d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019d44bd-2f6c-7621-8978-564fca75f6d4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019d44bd-2f6c-7621-8978-564fca75f6d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019d44bd-2f6c-777c-8508-e31a7aa348ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019d44bd-2f6c-7621-8978-564fca75f6d4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019d44bd-2f6c-777c-8508-e31a7aa348ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019d44bd-63af-7a07-8438-9e177fe41530" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019d44bd-2f6c-777c-8508-e31a7aa348ea" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019d44bd-63af-7a07-8438-9e177fe41530" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_019c8c8f-e9d5-75d9-bc9c-0701fbe41313" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8c8f-e9d5-7de3-adf1-68af23b8eb39" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_019c8c8f-e9d5-75d9-bc9c-0701fbe41313" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_019c8c8f-e9d5-75d9-bc9c-0701fbe41313" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_019c8c8f-e9d5-748f-acd8-8cb9421c861e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:to="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_019c8c8f-e9d5-748f-acd8-8cb9421c861e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_019c8c8f-e9d5-7cc7-8f3a-5ed790e32d30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_019c8c8f-e9d5-7cc7-8f3a-5ed790e32d30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019c8c8f-e9d5-770f-93c1-3a864c354747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019c8c8f-e9d5-770f-93c1-3a864c354747" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019d44bb-6ebf-7bc1-ada0-701bf36a4fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019d44bb-6ebf-7bc1-ada0-701bf36a4fa4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c8c8f-e9d5-7adc-b16b-265a52566f73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c8c8f-e9d5-748e-ab7e-1f11f62c2ce5" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c8c8f-e9d5-7adc-b16b-265a52566f73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019d44b9-fd27-7645-b2b1-dc2642302713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_019c8c8f-e9d5-75d9-bc9c-0701fbe41313" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019d44b9-fd27-7645-b2b1-dc2642302713" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_019c8c8f-e9d5-7cfc-8570-5af8125e4872" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateDerivativeLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019d44b9-fd27-7645-b2b1-dc2642302713" xlink:to="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_019c8c8f-e9d5-7cfc-8570-5af8125e4872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019c8c8f-e9d5-7a04-9abb-741601305615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019d44b9-fd27-7645-b2b1-dc2642302713" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019c8c8f-e9d5-7a04-9abb-741601305615" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_019c8c8f-e9d5-7018-bfdf-94bf5b4ef386" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8c8f-e9d5-7de3-adf1-68af23b8eb39" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_019c8c8f-e9d5-7018-bfdf-94bf5b4ef386" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019d44bc-b072-7f3e-a1e3-b74034e789e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_019c8c8f-e9d5-7018-bfdf-94bf5b4ef386" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019d44bc-b072-7f3e-a1e3-b74034e789e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019c8c8f-e9d5-70ee-a83b-3d8e8a0b2e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_019c8c8f-e9d5-7018-bfdf-94bf5b4ef386" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019c8c8f-e9d5-70ee-a83b-3d8e8a0b2e6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c8c8f-e9d5-719b-a4ca-d445a2df1e60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_019c8c8f-e9d5-7018-bfdf-94bf5b4ef386" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c8c8f-e9d5-719b-a4ca-d445a2df1e60" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/ReportableSegmentsDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#ReportableSegmentsDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/ReportableSegmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c8c8f-e9d5-73d3-80f5-25bf23776b0e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:to="loc_srt_ProductOrServiceAxis_019c8c8f-e9d5-73d3-80f5-25bf23776b0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-73d3-80f5-25bf23776b0e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c8c8f-e9d5-73d3-80f5-25bf23776b0e" xlink:to="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-73d3-80f5-25bf23776b0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-7151-9efb-5f14c8515f42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c8c8f-e9d5-73d3-80f5-25bf23776b0e" xlink:to="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-7151-9efb-5f14c8515f42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_FinancialServicesMember_019c8c8f-e9d5-774b-a833-171faff6c8c6" xlink:href="tru-20260331.xsd#tru_FinancialServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-7151-9efb-5f14c8515f42" xlink:to="loc_tru_FinancialServicesMember_019c8c8f-e9d5-774b-a833-171faff6c8c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_EmergingVerticalsMember_019c8c8f-e9d5-7fb0-9cc7-62d5de44db43" xlink:href="tru-20260331.xsd#tru_EmergingVerticalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-7151-9efb-5f14c8515f42" xlink:to="loc_tru_EmergingVerticalsMember_019c8c8f-e9d5-7fb0-9cc7-62d5de44db43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ConsumerInteractiveMember_019c8c8f-e9d5-7f40-86f9-7de254a7a2ba" xlink:href="tru-20260331.xsd#tru_ConsumerInteractiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c8c8f-e9d5-7151-9efb-5f14c8515f42" xlink:to="loc_tru_ConsumerInteractiveMember_019c8c8f-e9d5-7f40-86f9-7de254a7a2ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c8c8f-e9d5-7664-947e-104fc5acbef0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:to="loc_srt_ConsolidationItemsAxis_019c8c8f-e9d5-7664-947e-104fc5acbef0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7664-947e-104fc5acbef0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c8c8f-e9d5-7664-947e-104fc5acbef0" xlink:to="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7664-947e-104fc5acbef0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7c5b-ba0d-c16b67c9a7e1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c8c8f-e9d5-7664-947e-104fc5acbef0" xlink:to="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7c5b-ba0d-c16b67c9a7e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c8c8f-e9d5-7aff-b2d3-e4152021fbd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7c5b-ba0d-c16b67c9a7e1" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c8c8f-e9d5-7aff-b2d3-e4152021fbd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c8c8f-e9d5-71eb-93b9-fb599a2e2895" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7c5b-ba0d-c16b67c9a7e1" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c8c8f-e9d5-71eb-93b9-fb599a2e2895" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019c8c8f-e9d5-7d2a-80ec-b5ca662309f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c8c8f-e9d5-7c5b-ba0d-c16b67c9a7e1" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019c8c8f-e9d5-7d2a-80ec-b5ca662309f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7886-949a-0216981146f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-7bc8-9d77-9046f5a62e14" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7886-949a-0216981146f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_USMarketsMember_019c8c8f-e9d5-739c-8bd1-0ced8584c27a" xlink:href="tru-20260331.xsd#tru_USMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7886-949a-0216981146f7" xlink:to="loc_tru_USMarketsMember_019c8c8f-e9d5-739c-8bd1-0ced8584c27a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternationalMember_019c8c8f-e9d5-771f-894a-7bd30de1b95a" xlink:href="tru-20260331.xsd#tru_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7886-949a-0216981146f7" xlink:to="loc_tru_InternationalMember_019c8c8f-e9d5-771f-894a-7bd30de1b95a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ConsumerInteractiveMember_019c8c8f-e9d5-7a46-a71b-07b6e7a0b57e" xlink:href="tru-20260331.xsd#tru_ConsumerInteractiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7886-949a-0216981146f7" xlink:to="loc_tru_ConsumerInteractiveMember_019c8c8f-e9d5-7a46-a71b-07b6e7a0b57e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-79a2-b4fb-43306527bfa1" xlink:to="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b" xlink:to="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c8c8f-e9d5-74a5-aa9f-5a0e19e7e41b" xlink:to="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_019c8c8f-e9d5-733e-a59e-9ad8a02b49f9" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_country_CA_019c8c8f-e9d5-733e-a59e-9ad8a02b49f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LatinAmericaMember_019c8c8f-e9d5-78ab-bf6d-093770771477" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LatinAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_srt_LatinAmericaMember_019c8c8f-e9d5-78ab-bf6d-093770771477" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019c8c8f-e9d5-7548-a0bd-944f4ccba0cc" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_country_GB_019c8c8f-e9d5-7548-a0bd-944f4ccba0cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AfricaMember_019c8c8f-e9d5-77b4-8de0-479ea1dabd4f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AfricaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_srt_AfricaMember_019c8c8f-e9d5-77b4-8de0-479ea1dabd4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IN_019c8c8f-e9d5-7208-af7b-47a6bc4b577a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_country_IN_019c8c8f-e9d5-7208-af7b-47a6bc4b577a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019c8c8f-e9d5-7f1a-8b6a-0fdd2e6aae9c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_srt_AsiaPacificMember_019c8c8f-e9d5-7f1a-8b6a-0fdd2e6aae9c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_FinancialServicesMember_019c8c8f-e9d5-734d-90d0-f21dc133c6b0" xlink:href="tru-20260331.xsd#tru_FinancialServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8c8f-e9d5-788c-95dc-2426992e8ae2" xlink:to="loc_tru_FinancialServicesMember_019c8c8f-e9d5-734d-90d0-f21dc133c6b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019c8c8f-e9d5-7323-b829-a79b217299a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019c8c8f-e9d5-7323-b829-a79b217299a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019d44cd-f699-7c71-a17e-89755743e6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_NumberOfReportableSegments_019d44cd-f699-7c71-a17e-89755743e6c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c8c8f-e9d5-7661-b542-70f2aafa0b62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c8c8f-e9d5-7661-b542-70f2aafa0b62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:href="tru-20260331.xsd#tru_EBITDAAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ProductAndFulfillment_019c8c8f-e9d5-7455-80aa-d99b83d517f0" xlink:href="tru-20260331.xsd#tru_ProductAndFulfillment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_ProductAndFulfillment_019c8c8f-e9d5-7455-80aa-d99b83d517f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019c8c8f-e9d5-7521-97d9-165e045fa816" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019c8c8f-e9d5-7521-97d9-165e045fa816" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_019c8c8f-e9d5-7f0d-aa85-4dd4bbd2d75b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_019c8c8f-e9d5-7f0d-aa85-4dd4bbd2d75b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c8c8f-e9d5-7a08-8f9d-17b55a6903ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c8c8f-e9d5-7a08-8f9d-17b55a6903ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_SegmentsAdjustedEBITDA_019c8c8f-e9d5-77fc-b130-af17be0c9de4" xlink:href="tru-20260331.xsd#tru_SegmentsAdjustedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_SegmentsAdjustedEBITDA_019c8c8f-e9d5-77fc-b130-af17be0c9de4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentCorporateExpense_019c8c8f-e9d5-777b-afe9-e96650dbbcf2" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentCorporateExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentCorporateExpense_019c8c8f-e9d5-777b-afe9-e96650dbbcf2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentNetInterestExpense_019c8c8f-e9d5-7b9c-b667-5328abc3d6a1" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentNetInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentNetInterestExpense_019c8c8f-e9d5-7b9c-b667-5328abc3d6a1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentDepreciationandAmortization_019c8c8f-e9d5-7e00-a91e-e7fc5061ff44" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentDepreciationandAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentDepreciationandAmortization_019c8c8f-e9d5-7e00-a91e-e7fc5061ff44" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentStockbasedCompensation_019c8c8f-e9d5-76cc-94c3-ad5f9fbdc50f" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentStockbasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentStockbasedCompensation_019c8c8f-e9d5-76cc-94c3-ad5f9fbdc50f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentMergersandAcquisition_019c8c8f-e9d5-7a8f-be94-52d2a181e256" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentMergersandAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentMergersandAcquisition_019c8c8f-e9d5-7a8f-be94-52d2a181e256" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentAcceleratedTechnology_019c8c8f-e9d5-7f5c-a3b8-3d8021e65894" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentAcceleratedTechnology"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentAcceleratedTechnology_019c8c8f-e9d5-7f5c-a3b8-3d8021e65894" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentOperatingModelOptimizationProgram_019c8c8f-e9d5-76bd-b5f2-2c61488027e7" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentOperatingModelOptimizationProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentOperatingModelOptimizationProgram_019c8c8f-e9d5-76bd-b5f2-2c61488027e7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentOther_019c8c8f-e9d5-7557-8f90-1c8e16829ec1" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentOther_019c8c8f-e9d5-7557-8f90-1c8e16829ec1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c8c8f-e9d5-79aa-b48b-abfe814e1cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c8c8f-e9d5-79aa-b48b-abfe814e1cfa" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_AdjustedEBITDAAdjustmentTotal_019c8c8f-e9d5-7ec7-ada6-14fba2b3c133" xlink:href="tru-20260331.xsd#tru_AdjustedEBITDAAdjustmentTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_tru_AdjustedEBITDAAdjustmentTotal_019c8c8f-e9d5-7ec7-ada6-14fba2b3c133" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c8c8f-e9d5-78e9-b5f9-35226868cf07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tru_EBITDAAbstract_019c8c8f-e9d5-795c-9410-5da2124c779b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c8c8f-e9d5-78e9-b5f9-35226868cf07" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c8c8f-e9d5-74e3-8c8f-9eec9ea1dcd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_Assets_019c8c8f-e9d5-74e3-8c8f-9eec9ea1dcd3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c8c8f-e9d5-709f-8d56-6c2d8a63cc57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c8c8f-e9d5-709f-8d56-6c2d8a63cc57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019c8c8f-e9d5-7235-9175-c0e1d232889c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-72a4-99d0-ccc2237f4b77" xlink:to="loc_us-gaap_DepreciationAndAmortization_019c8c8f-e9d5-7235-9175-c0e1d232889c" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/ReportableSegmentsEarningsfromEquityMethodInvestmentsIncludedinNonOperatingIncomeandExpenseDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#ReportableSegmentsEarningsfromEquityMethodInvestmentsIncludedinNonOperatingIncomeandExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/ReportableSegmentsEarningsfromEquityMethodInvestmentsIncludedinNonOperatingIncomeandExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-7e14-a9fc-d35623d80a06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-7965-ac26-53e804aef186" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-7e14-a9fc-d35623d80a06" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-7965-ac26-53e804aef186" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-74be-82b2-7a6f3827d29b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8c8f-e9d5-7965-ac26-53e804aef186" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-74be-82b2-7a6f3827d29b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-74be-82b2-7a6f3827d29b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-74be-82b2-7a6f3827d29b" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-74be-82b2-7a6f3827d29b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7dee-a0c3-97aec487de6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8c8f-e9d5-74be-82b2-7a6f3827d29b" xlink:to="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7dee-a0c3-97aec487de6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_USMarketsMember_019c8c8f-e9d5-7601-9da9-d626f366441c" xlink:href="tru-20260331.xsd#tru_USMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7dee-a0c3-97aec487de6f" xlink:to="loc_tru_USMarketsMember_019c8c8f-e9d5-7601-9da9-d626f366441c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_InternationalMember_019c8c8f-e9d5-7166-afe1-0aeee806691b" xlink:href="tru-20260331.xsd#tru_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8c8f-e9d5-7dee-a0c3-97aec487de6f" xlink:to="loc_tru_InternationalMember_019c8c8f-e9d5-7166-afe1-0aeee806691b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c8c8f-e9d5-7d57-be8c-d3d4592662c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8c8f-e9d5-7e14-a9fc-d35623d80a06" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c8c8f-e9d5-7d57-be8c-d3d4592662c2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/ContingenciesDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#ContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/ContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c8c8f-e9d5-752b-9b66-d6bd56b25547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c8c8f-e9d5-734e-937c-ed16c2efb1a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c8c8f-e9d5-752b-9b66-d6bd56b25547" xlink:to="loc_us-gaap_LossContingenciesTable_019c8c8f-e9d5-734e-937c-ed16c2efb1a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019c8c8f-e9d5-718b-952e-a58bf478b3e9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c8c8f-e9d5-734e-937c-ed16c2efb1a0" xlink:to="loc_srt_LitigationCaseAxis_019c8c8f-e9d5-718b-952e-a58bf478b3e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019c8c8f-e9d5-718b-952e-a58bf478b3e9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019c8c8f-e9d5-718b-952e-a58bf478b3e9" xlink:to="loc_srt_LitigationCaseTypeDomain_019c8c8f-e9d5-718b-952e-a58bf478b3e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019c8c8f-e9d5-7b68-98e0-2310d621cfa3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019c8c8f-e9d5-718b-952e-a58bf478b3e9" xlink:to="loc_srt_LitigationCaseTypeDomain_019c8c8f-e9d5-7b68-98e0-2310d621cfa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_ConsumerFinancialProtectionBureauMember_019c8c8f-e9d5-7bab-be67-0888a8f98cc5" xlink:href="tru-20260331.xsd#tru_ConsumerFinancialProtectionBureauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019c8c8f-e9d5-7b68-98e0-2310d621cfa3" xlink:to="loc_tru_ConsumerFinancialProtectionBureauMember_019c8c8f-e9d5-7bab-be67-0888a8f98cc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserveCurrent_019c8c8f-e9d5-795f-9ab3-ce6cafc505dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c8c8f-e9d5-752b-9b66-d6bd56b25547" xlink:to="loc_us-gaap_LitigationReserveCurrent_019c8c8f-e9d5-795f-9ab3-ce6cafc505dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c8c8f-e9d5-7a30-806c-fdfc94af1f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c8c8f-e9d5-752b-9b66-d6bd56b25547" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c8c8f-e9d5-7a30-806c-fdfc94af1f6b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.transunion.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="tru-20260331.xsd#AccumulatedOtherComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.transunion.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8c8f-e9d5-7348-ba6a-b0d40c92bea8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8c8f-e9d5-7348-ba6a-b0d40c92bea8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e9d5-787d-974a-72f23911b6b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8c8f-e9d5-7348-ba6a-b0d40c92bea8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e9d5-787d-974a-72f23911b6b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8c8f-e9d5-787d-974a-72f23911b6b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e9d5-787d-974a-72f23911b6b7" xlink:to="loc_us-gaap_EquityComponentDomain_019c8c8f-e9d5-787d-974a-72f23911b6b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8c8f-e9d5-7911-a415-207a440bac2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8c8f-e9d5-787d-974a-72f23911b6b7" xlink:to="loc_us-gaap_EquityComponentDomain_019c8c8f-e9d5-7911-a415-207a440bac2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e9d5-7c2e-98bd-996c97e3b466" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8c8f-e9d5-7911-a415-207a440bac2b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e9d5-7c2e-98bd-996c97e3b466" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8c8f-e9d5-7236-8e3e-983445728c20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e9d5-7c2e-98bd-996c97e3b466" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8c8f-e9d5-7236-8e3e-983445728c20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c8c8f-e9d5-7a73-88b7-6d0d96dae362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e9d5-7c2e-98bd-996c97e3b466" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c8c8f-e9d5-7a73-88b7-6d0d96dae362" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019c8c8f-e9d5-7a97-b7d3-0933d7596f19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8c8f-e9d5-7c2e-98bd-996c97e3b466" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019c8c8f-e9d5-7a97-b7d3-0933d7596f19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c8c8f-e9d5-7385-a37b-251a79457442" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c8c8f-e9d5-7385-a37b-251a79457442" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e9d5-7f23-927a-c93e4483761b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c8c8f-e9d5-7385-a37b-251a79457442" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e9d5-7f23-927a-c93e4483761b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8c8f-e9d5-7c71-a98e-993480f27721" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c8c8f-e9d5-7385-a37b-251a79457442" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8c8f-e9d5-7c71-a98e-993480f27721" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e9d5-7039-8d16-01d5375ecec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c8c8f-e9d5-77fd-ba41-b1d5ebb18515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c8c8f-e9d5-77fd-ba41-b1d5ebb18515" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019c8c8f-e9d5-772e-a036-3e42a22d2dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019c8c8f-e9d5-772e-a036-3e42a22d2dfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c8c8f-e9d5-7d60-9f27-a5c8467174db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c8c8f-e9d5-7d60-9f27-a5c8467174db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e9d5-77d1-9741-dcba14b891aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8c8f-e9d5-7c83-a50e-0762ce989e06" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019c8c8f-e9d5-77d1-9741-dcba14b891aa" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_tru_MohamedF.AbdelsadekMember_019c8c8f-e9d5-7e3d-9357-14c0cf574162" xlink:href="tru-20260331.xsd#tru_MohamedF.AbdelsadekMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_tru_MohamedF.AbdelsadekMember_019c8c8f-e9d5-7e3d-9357-14c0cf574162" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>