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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e3c6a-ce1e-7202-8f85-774fa821c16c,g:ee03886d-40bd-458e-92c4-7584ae2d52ca-->
<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.uti.edu/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="simple" xlink:href="uti-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e3c6a-cfc0-702b-b392-9807144bd2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e3c6a-cfc0-71b4-b2c3-21cdaae7ac1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e3c6a-cfc0-702b-b392-9807144bd2a2" xlink:to="loc_us-gaap_StatementTable_019e3c6a-cfc0-71b4-b2c3-21cdaae7ac1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e3c6a-cfc0-71b4-b2c3-21cdaae7ac1e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7" xlink:to="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e3c6a-cfc0-76a6-a175-5b8a1c8467c7" xlink:to="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e3c6a-cfc0-7e8c-84f2-b01e366007ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:to="loc_us-gaap_CommonStockMember_019e3c6a-cfc0-7e8c-84f2-b01e366007ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e3c6a-cfc0-74b5-bb43-fd518c0d34a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e3c6a-cfc0-74b5-bb43-fd518c0d34a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e3c6a-cfc0-75db-a9a0-503867671e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e3c6a-cfc0-75db-a9a0-503867671e9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e3c6a-cfc0-7f80-926b-d81257921461" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:to="loc_us-gaap_RetainedEarningsMember_019e3c6a-cfc0-7f80-926b-d81257921461" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e3c6a-cfc0-77ce-8b93-ce9e79211c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3c6a-cfc0-7d12-8e0f-c540cf5ec53b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e3c6a-cfc0-77ce-8b93-ce9e79211c0f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3c6a-cfc0-702b-b392-9807144bd2a2" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e3c6a-cfc0-773b-8589-0ca78b208fda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e3c6a-cfc0-773b-8589-0ca78b208fda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e3c6a-cfc0-7931-acef-423c7268c0ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_StockholdersEquity_019e3c6a-cfc0-7931-acef-423c7268c0ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019e3c6a-cfc0-7379-9d9d-940851b1b0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019e3c6a-cfc0-7379-9d9d-940851b1b0a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e3c6a-cfc0-76d8-9075-9633039d2066" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_NetIncomeLoss_019e3c6a-cfc0-76d8-9075-9633039d2066" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e3c6a-cfc0-7323-a60e-312cb845d1be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e3c6a-cfc0-7323-a60e-312cb845d1be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e3c6a-cfc0-76ff-9f10-8266994f4aba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e3c6a-cfc0-76ff-9f10-8266994f4aba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e3c6a-cfc0-7239-859f-0c2db15ba95e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e3c6a-cfc0-7239-859f-0c2db15ba95e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e3c6a-cfc0-704b-ae64-7b871dee7981" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e3c6a-cfc0-704b-ae64-7b871dee7981" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e3c6a-cfc0-7011-ac3e-2814070fde8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e3c6a-cfc0-7011-ac3e-2814070fde8d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e3c6a-cfc0-74d4-96b9-5ca8e68e723d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e3c6a-cfc0-74d4-96b9-5ca8e68e723d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019e3c6a-cfc0-70b3-a834-9f2034493dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019e3c6a-cfc0-70b3-a834-9f2034493dcb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e3c6a-cfc0-720f-818a-440bd5fd0f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e3c6a-cfc0-720f-818a-440bd5fd0f8a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019e3c6a-cfc0-7be4-ad1a-0549e20200fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3c6a-cfc0-7979-af0c-f87779416cfd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_019e3c6a-cfc0-7be4-ad1a-0549e20200fd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e3c6a-cfc0-7808-9997-358771b495be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e3c6a-cfc0-7b10-b9fd-eb5ff4e33032" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019e3c6a-cfc0-76b7-a3d6-f2fb3b7d5105" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/NatureoftheBusinessDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#NatureoftheBusinessDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/NatureoftheBusinessDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_019e3c6a-cfc0-7b9b-b105-5accd8cfc35e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_019e3c6a-cfc0-7415-bd93-5b70477ff39d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_019e3c6a-cfc0-7b9b-b105-5accd8cfc35e" xlink:to="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_019e3c6a-cfc0-7415-bd93-5b70477ff39d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-cfc0-7609-9136-cfa36325d49b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_019e3c6a-cfc0-7415-bd93-5b70477ff39d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-cfc0-7609-9136-cfa36325d49b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7609-9136-cfa36325d49b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-cfc0-7609-9136-cfa36325d49b" xlink:to="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7609-9136-cfa36325d49b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7db1-8ab4-3b8eb9c6642b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-cfc0-7609-9136-cfa36325d49b" xlink:to="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7db1-8ab4-3b8eb9c6642b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_UTIMember_019e3c6a-cfc0-7216-9a27-9cbdca56131c" xlink:href="uti-20260630.xsd#uti_UTIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7db1-8ab4-3b8eb9c6642b" xlink:to="loc_uti_UTIMember_019e3c6a-cfc0-7216-9a27-9cbdca56131c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_ConcordeMember_019e3c6a-cfc0-710f-93d3-545f47bb401e" xlink:href="uti-20260630.xsd#uti_ConcordeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3c6a-cfc0-7db1-8ab4-3b8eb9c6642b" xlink:to="loc_uti_ConcordeMember_019e3c6a-cfc0-710f-93d3-545f47bb401e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_019e3c6a-cfc0-7415-bd93-5b70477ff39d" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fa5c3-69c9-738d-aa00-ee5a63e47b57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fa5c3-69c9-7bb5-8526-ea3ac3f2624e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fa5c3-69c9-738d-aa00-ee5a63e47b57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019fa5c3-913f-7cdd-9144-7e8fa2f85345" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019fa5c3-69c9-738d-aa00-ee5a63e47b57" xlink:to="loc_us-gaap_SubsequentEventMember_019fa5c3-913f-7cdd-9144-7e8fa2f85345" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e3c6a-cfc0-7c25-af5b-4ae42a8c452e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_019e3c6a-cfc0-7b9b-b105-5accd8cfc35e" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e3c6a-cfc0-7c25-af5b-4ae42a8c452e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_NumberOfCampuses_019e3c6a-cfc0-7725-8508-8a5574651ff5" xlink:href="uti-20260630.xsd#uti_NumberOfCampuses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_019e3c6a-cfc0-7b9b-b105-5accd8cfc35e" xlink:to="loc_uti_NumberOfCampuses_019e3c6a-cfc0-7725-8508-8a5574651ff5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_NumberOfStates_019e3c6a-cfc0-7977-aec9-ac845fa5c751" xlink:href="uti-20260630.xsd#uti_NumberOfStates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_019e3c6a-cfc0-7b9b-b105-5accd8cfc35e" xlink:to="loc_uti_NumberOfStates_019e3c6a-cfc0-7977-aec9-ac845fa5c751" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_CorporateAndGovernmentBondsMember_019e3c6a-cfc0-79e6-a8e7-0a5def6ade7e" xlink:href="uti-20260630.xsd#uti_CorporateAndGovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:to="loc_uti_CorporateAndGovernmentBondsMember_019e3c6a-cfc0-79e6-a8e7-0a5def6ade7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e6e5f-d8fb-72d6-a936-2a23d1a8ea1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e6e5f-d8fb-72d6-a936-2a23d1a8ea1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3c6a-cfc0-786e-a879-e8d8e651db9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3c6a-cfc0-786e-a879-e8d8e651db9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3c6a-cfc0-73a0-b6d7-dfb25d7d555e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3c6a-cfc0-73a0-b6d7-dfb25d7d555e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3c6a-cfc0-7232-a860-3c76ffb6d55f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3c6a-cfc0-7232-a860-3c76ffb6d55f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3c6a-cfc0-7637-ad3f-bb0bb5d2ea7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3c6a-cfc0-7637-ad3f-bb0bb5d2ea7e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_019e3c6a-cfc0-7cce-8002-68d63ac8b587" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_019e3c6a-cfc0-7cce-8002-68d63ac8b587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent_019e3c6a-cfc0-70ec-88ee-272378e50a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent_019e3c6a-cfc0-70ec-88ee-272378e50a6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019e3c6a-cfc0-7f73-8e9f-3534d4487560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019e3c6a-cfc0-7f73-8e9f-3534d4487560" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e3c6a-cfc0-78aa-84f7-c7d96b449d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e3c6a-cfc0-78aa-84f7-c7d96b449d1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_019e3c6a-cfc0-7d2c-a466-b40a1f031fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_019e3c6a-cfc0-7d2c-a466-b40a1f031fdb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent_019e3c6a-cfc0-7962-ab30-0a5019c85b32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent_019e3c6a-cfc0-7962-ab30-0a5019c85b32" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_019e3c6a-cfc0-728f-a82b-597bca06c6be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_019e3c6a-cfc0-728f-a82b-597bca06c6be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_019e3c6a-cfc0-7802-a337-70adf82df5c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_019e3c6a-cfc0-7802-a337-70adf82df5c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_019e3c6a-cfc0-73d0-af3e-e5fae1378daf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_019e3c6a-cfc0-73d0-af3e-e5fae1378daf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue_019e3c6a-cfc0-7b70-90ac-8d6d4790398b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue_019e3c6a-cfc0-7b70-90ac-8d6d4790398b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails_1" xlink:type="simple" xlink:href="uti-20260630.xsd#InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails_1"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/InvestmentsFairValueOfInvestmentsClassifiedasHeldtoMaturityDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3c6a-cfc0-785d-a48d-3afee47615f5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3c6a-cfc0-7c7b-97a0-2adc482d2e65" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_CorporateAndGovernmentBondsMember_019e3c6a-cfc0-79e6-a8e7-0a5def6ade7e" xlink:href="uti-20260630.xsd#uti_CorporateAndGovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3c6a-cfc0-7d47-a71b-005ee6fe6538" xlink:to="loc_uti_CorporateAndGovernmentBondsMember_019e3c6a-cfc0-79e6-a8e7-0a5def6ade7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3c6a-cfc0-786e-a879-e8d8e651db9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3c6a-cfc0-786e-a879-e8d8e651db9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3c6a-cfc0-73a0-b6d7-dfb25d7d555e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3c6a-cfc0-73a0-b6d7-dfb25d7d555e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3c6a-cfc0-7232-a860-3c76ffb6d55f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3c6a-cfc0-7232-a860-3c76ffb6d55f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3c6a-cfc0-7637-ad3f-bb0bb5d2ea7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-710f-a580-96af1eaa5ac3" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3c6a-cfc0-7637-ad3f-bb0bb5d2ea7e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_019e3c6a-cfc0-7cce-8002-68d63ac8b587" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_019e3c6a-cfc0-7cce-8002-68d63ac8b587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent_019e3c6a-cfc0-70ec-88ee-272378e50a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent_019e3c6a-cfc0-70ec-88ee-272378e50a6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019e3c6a-cfc0-7f73-8e9f-3534d4487560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019e3c6a-cfc0-7f73-8e9f-3534d4487560" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e3c6a-cfc0-78aa-84f7-c7d96b449d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e3c6a-cfc0-78aa-84f7-c7d96b449d1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_019e3c6a-cfc0-7d2c-a466-b40a1f031fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_019e3c6a-cfc0-7d2c-a466-b40a1f031fdb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent_019e3c6a-cfc0-7962-ab30-0a5019c85b32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossAbstract_019e3c6a-cfc0-7e39-9d68-caa3d1f24df6" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueNoncurrent_019e3c6a-cfc0-7962-ab30-0a5019c85b32" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_019e3c6a-cfc0-728f-a82b-597bca06c6be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_019e3c6a-cfc0-728f-a82b-597bca06c6be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_019e3c6a-cfc0-7802-a337-70adf82df5c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_019e3c6a-cfc0-7802-a337-70adf82df5c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_019e3c6a-cfc0-73d0-af3e-e5fae1378daf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_019e3c6a-cfc0-73d0-af3e-e5fae1378daf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue_019e3c6a-cfc0-7b70-90ac-8d6d4790398b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3c6a-cfc0-7aa2-beeb-f8edc0d611c6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue_019e3c6a-cfc0-7b70-90ac-8d6d4790398b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3c6a-d081-72ff-81e8-942a8cc55e38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3c6a-d081-72ff-81e8-942a8cc55e38" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3c6a-d081-72ff-81e8-942a8cc55e38" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-788a-9eb5-a2b0b259f1bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3c6a-d081-7ebd-841c-9ad1a7b1a9a9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-788a-9eb5-a2b0b259f1bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e3c6a-d081-7cc6-b8c8-77a1734443ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-788a-9eb5-a2b0b259f1bc" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e3c6a-d081-7cc6-b8c8-77a1734443ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e3c6a-d081-7b6b-92a5-2086dc8f80ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-788a-9eb5-a2b0b259f1bc" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e3c6a-d081-7b6b-92a5-2086dc8f80ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3c6a-d081-791b-bcff-9b16ba196934" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3c6a-d081-788a-9eb5-a2b0b259f1bc" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3c6a-d081-791b-bcff-9b16ba196934" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e3c6a-d081-7fab-bfc7-e261dde645ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e3c6a-d081-7fab-bfc7-e261dde645ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019e3c6a-d081-71b6-ad2b-0b3bbd104928" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019e3c6a-d081-71b6-ad2b-0b3bbd104928" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_019e3c6a-d081-7079-a74d-d644e2d2279f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_019e3c6a-d081-7079-a74d-d644e2d2279f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e3c6a-d081-7c4c-894d-b9dee8e3e8f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019e3c6a-d081-7c4c-894d-b9dee8e3e8f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019e3c6a-d081-73a1-86ae-2bb106563911" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019e3c6a-d081-73a1-86ae-2bb106563911" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019e3c6a-d081-76c2-82f4-a9e8f466496a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3c6a-d081-7154-8986-d3d26462179e" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019e3c6a-d081-76c2-82f4-a9e8f466496a" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/PropertyandEquipmentnetPropertyandEquipmentDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#PropertyandEquipmentnetPropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/PropertyandEquipmentnetPropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e3c6a-d081-7736-a088-eba48d94aead" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e3c6a-d081-7736-a088-eba48d94aead" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e3c6a-d081-7e99-ad6e-6b9d98be0481" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e3c6a-d081-7736-a088-eba48d94aead" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e3c6a-d081-7e99-ad6e-6b9d98be0481" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-7e99-ad6e-6b9d98be0481_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e3c6a-d081-7e99-ad6e-6b9d98be0481" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-7e99-ad6e-6b9d98be0481_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e3c6a-d081-7e99-ad6e-6b9d98be0481" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_019e3c6a-d081-7704-a12f-55090a461a52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_LandMember_019e3c6a-d081-7704-a12f-55090a461a52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e3c6a-d081-7ed7-8975-ddfe1d69da3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e3c6a-d081-7ed7-8975-ddfe1d69da3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019e3c6a-d081-72c1-ba21-124c47edd073" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019e3c6a-d081-72c1-ba21-124c47edd073" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_TrainingEquipmentMember_019e3c6a-d081-79b1-a816-0bfe40691955" xlink:href="uti-20260630.xsd#uti_TrainingEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_uti_TrainingEquipmentMember_019e3c6a-d081-79b1-a816-0bfe40691955" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_OfficeAndComputerEquipmentMember_019e3c6a-d081-7643-9578-b738a5ccf7f1" xlink:href="uti-20260630.xsd#uti_OfficeAndComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_uti_OfficeAndComputerEquipmentMember_019e3c6a-d081-7643-9578-b738a5ccf7f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_019e3c6a-d081-7780-b464-78125b2a4246" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_019e3c6a-d081-7780-b464-78125b2a4246" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_InternallyDevelopedCurriculumMember_019e3c6a-d081-7e58-96f9-a8cae7094fb8" xlink:href="uti-20260630.xsd#uti_InternallyDevelopedCurriculumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_uti_InternallyDevelopedCurriculumMember_019e3c6a-d081-7e58-96f9-a8cae7094fb8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_019e3c6a-d081-7a13-ad73-c5a183d18332" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_VehiclesMember_019e3c6a-d081-7a13-ad73-c5a183d18332" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_RightOfUseAssetsForFinanceLeasesMember_019e3c6a-d081-79b2-9e26-6774d1518f4e" xlink:href="uti-20260630.xsd#uti_RightOfUseAssetsForFinanceLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_uti_RightOfUseAssetsForFinanceLeasesMember_019e3c6a-d081-79b2-9e26-6774d1518f4e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_019e3c6a-d081-7327-b784-fa0657395ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e3c6a-d081-78c7-9e24-1585840164f8" xlink:to="loc_us-gaap_ConstructionInProgressMember_019e3c6a-d081-7327-b784-fa0657395ce2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3c6a-d081-760c-928a-19464ec212b2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e3c6a-d081-7736-a088-eba48d94aead" xlink:to="loc_srt_RangeAxis_019e3c6a-d081-760c-928a-19464ec212b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d081-760c-928a-19464ec212b2_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3c6a-d081-760c-928a-19464ec212b2" xlink:to="loc_srt_RangeMember_019e3c6a-d081-760c-928a-19464ec212b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d081-7cf6-ad1a-48e4f0dbc29f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3c6a-d081-760c-928a-19464ec212b2" xlink:to="loc_srt_RangeMember_019e3c6a-d081-7cf6-ad1a-48e4f0dbc29f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3c6a-d081-718f-b6d4-86f3e510a4f9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d081-7cf6-ad1a-48e4f0dbc29f" xlink:to="loc_srt_MinimumMember_019e3c6a-d081-718f-b6d4-86f3e510a4f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3c6a-d081-7cb7-88ed-3af0daeba56a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d081-7cf6-ad1a-48e4f0dbc29f" xlink:to="loc_srt_MaximumMember_019e3c6a-d081-7cb7-88ed-3af0daeba56a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e3c6a-d081-7cb1-83f2-51b40e765d20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e3c6a-d081-7cb1-83f2-51b40e765d20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019e3c6a-d081-77d0-9236-bd5642ac3d36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019e3c6a-d081-77d0-9236-bd5642ac3d36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019e3c6a-d081-7064-96e9-52a8dcfbf21a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019e3c6a-d081-7064-96e9-52a8dcfbf21a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e3c6a-d081-70b8-9d11-7945995dac07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e3c6a-d081-70b8-9d11-7945995dac07" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e3c6a-d081-7532-9c29-8183e0f98b5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e3c6a-d081-7532-9c29-8183e0f98b5f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e3c6a-d081-790d-936e-e6bf18baad8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e3c6a-d081-7e49-afd2-87b63e1a9641" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e3c6a-d081-790d-936e-e6bf18baad8b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/IntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#IntangibleAssetsScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/IntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3c6a-d082-75f0-b7c5-5c5070f0c916" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3c6a-d082-75f0-b7c5-5c5070f0c916" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-77fa-a89f-8a11fd7c56e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3c6a-d082-75f0-b7c5-5c5070f0c916" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-77fa-a89f-8a11fd7c56e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-77fa-a89f-8a11fd7c56e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-77fa-a89f-8a11fd7c56e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-77fa-a89f-8a11fd7c56e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-77fa-a89f-8a11fd7c56e1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_019e3c6a-d082-7323-8a63-fe158b35aaf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_019e3c6a-d082-7323-8a63-fe158b35aaf3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_InternallyDevelopedCurriculumMember_019e3c6a-d082-7885-a84e-ab14e60080d2" xlink:href="uti-20260630.xsd#uti_InternallyDevelopedCurriculumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:to="loc_uti_InternallyDevelopedCurriculumMember_019e3c6a-d082-7885-a84e-ab14e60080d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019e3c6a-d082-71db-b613-02a177e4326d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019e3c6a-d082-71db-b613-02a177e4326d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_CurriculumDevelopmentMember_019e3c6a-d082-7baa-bc30-7295bcf511b6" xlink:href="uti-20260630.xsd#uti_CurriculumDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-75d0-98e5-a945cc91a684" xlink:to="loc_uti_CurriculumDevelopmentMember_019e3c6a-d082-7baa-bc30-7295bcf511b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-7a86-b934-2ea24ff4a6ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3c6a-d082-75f0-b7c5-5c5070f0c916" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-7a86-b934-2ea24ff4a6ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7a86-b934-2ea24ff4a6ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-7a86-b934-2ea24ff4a6ea" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7a86-b934-2ea24ff4a6ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7259-bec6-5b67fc00deb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e3c6a-d082-7a86-b934-2ea24ff4a6ea" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7259-bec6-5b67fc00deb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AccreditationsAndRegulatoryApprovalsMember_019e3c6a-d082-7655-8895-c4ec8b857e07" xlink:href="uti-20260630.xsd#uti_AccreditationsAndRegulatoryApprovalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7259-bec6-5b67fc00deb5" xlink:to="loc_uti_AccreditationsAndRegulatoryApprovalsMember_019e3c6a-d082-7655-8895-c4ec8b857e07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_DevelopmentInProgressMember_019f88b1-b289-746c-8eaf-9c87c0d485b9" xlink:href="uti-20260630.xsd#uti_DevelopmentInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e3c6a-d082-7259-bec6-5b67fc00deb5" xlink:to="loc_uti_DevelopmentInProgressMember_019f88b1-b289-746c-8eaf-9c87c0d485b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e3c6a-d082-79ee-8245-56bb60ef23dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e3c6a-d082-79ee-8245-56bb60ef23dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e3c6a-d082-7cb9-a6c3-71abd465e08d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e3c6a-d082-7cb9-a6c3-71abd465e08d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3c6a-d082-7cd3-8de8-94f339da2623" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3c6a-d082-7cd3-8de8-94f339da2623" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019e3c6a-d082-75bd-bc56-d78c76378faf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019e3c6a-d082-75bd-bc56-d78c76378faf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019e3c6a-d082-71e3-ab01-7afc21ee0fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019e3c6a-d082-70be-82b3-23ed19656546" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019e3c6a-d082-70be-82b3-23ed19656546" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019e3c6a-d082-7efd-b6c5-b4de4979ee11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019e3c6a-d082-7efd-b6c5-b4de4979ee11" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e3c6a-d082-76d3-97f2-1a9c64857719" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3c6a-d082-7c6d-920a-7e4739572556" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e3c6a-d082-76d3-97f2-1a9c64857719" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019e3c6a-d082-72ab-ac5f-ac7465912ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019e3c6a-d082-72ab-ac5f-ac7465912ef7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3c6a-d082-76e2-b4ee-bcf3424b675b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e3c6a-d082-72ab-ac5f-ac7465912ef7" xlink:to="loc_srt_RangeAxis_019e3c6a-d082-76e2-b4ee-bcf3424b675b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d082-76e2-b4ee-bcf3424b675b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3c6a-d082-76e2-b4ee-bcf3424b675b" xlink:to="loc_srt_RangeMember_019e3c6a-d082-76e2-b4ee-bcf3424b675b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d082-7963-96c8-bb9b4f86d132" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3c6a-d082-76e2-b4ee-bcf3424b675b" xlink:to="loc_srt_RangeMember_019e3c6a-d082-7963-96c8-bb9b4f86d132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3c6a-d082-7b29-af0f-bc48718cbf27" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d082-7963-96c8-bb9b4f86d132" xlink:to="loc_srt_MinimumMember_019e3c6a-d082-7b29-af0f-bc48718cbf27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3c6a-d082-743e-a46b-af2f1d0e6811" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d082-7963-96c8-bb9b4f86d132" xlink:to="loc_srt_MaximumMember_019e3c6a-d082-743e-a46b-af2f1d0e6811" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e3c6a-d082-7d1f-8304-78c0593351dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e3c6a-d082-72ab-ac5f-ac7465912ef7" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e3c6a-d082-7d1f-8304-78c0593351dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e3c6a-d082-7d1f-8304-78c0593351dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e3c6a-d082-7d1f-8304-78c0593351dd" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e3c6a-d082-7d1f-8304-78c0593351dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e3c6a-d082-7180-bd84-7016fbc76743" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e3c6a-d082-7d1f-8304-78c0593351dd" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e3c6a-d082-7180-bd84-7016fbc76743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_OperatingLeaseLeaseNotYetCommencedOneMember_019e3c6a-d082-71df-89ea-e5aca5eff132" xlink:href="uti-20260630.xsd#uti_OperatingLeaseLeaseNotYetCommencedOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e3c6a-d082-7180-bd84-7016fbc76743" xlink:to="loc_uti_OperatingLeaseLeaseNotYetCommencedOneMember_019e3c6a-d082-71df-89ea-e5aca5eff132" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LesseeOperatingLeaseNumberOfContracts_019e3c6a-d082-7827-95af-c76b53839325" xlink:href="uti-20260630.xsd#uti_LesseeOperatingLeaseNumberOfContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_uti_LesseeOperatingLeaseNumberOfContracts_019e3c6a-d082-7827-95af-c76b53839325" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_OperatingLeaseNumberOfLeasableCampuses_019e3c6a-d082-7906-8fec-4637ece28ca9" xlink:href="uti-20260630.xsd#uti_OperatingLeaseNumberOfLeasableCampuses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_uti_OperatingLeaseNumberOfLeasableCampuses_019e3c6a-d082-7906-8fec-4637ece28ca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_OperatingLeaseNumberOfOtherLocationsLeased_019e3c6a-d082-71f8-97de-14c96f813978" xlink:href="uti-20260630.xsd#uti_OperatingLeaseNumberOfOtherLocationsLeased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_uti_OperatingLeaseNumberOfOtherLocationsLeased_019e3c6a-d082-71f8-97de-14c96f813978" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019e3c6a-d082-7fe0-9ccf-a0abe331dac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019e3c6a-d082-7fe0-9ccf-a0abe331dac6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019e3c6a-d082-723f-8a2d-30463215ed04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019e3c6a-d082-723f-8a2d-30463215ed04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019e3c6a-d082-75fc-80c8-0e6e707f1bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3c6a-d082-71e0-b625-54dc8ac576b8" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019e3c6a-d082-75fc-80c8-0e6e707f1bb3" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-77c4-a733-d106c7122071" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-77c4-a733-d106c7122071" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f71-bae5-f218f325411d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-77c4-a733-d106c7122071" xlink:to="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f71-bae5-f218f325411d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7f71-bae5-f218f325411d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f71-bae5-f218f325411d" xlink:to="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7f71-bae5-f218f325411d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7a81-b364-ea9264c92e43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f71-bae5-f218f325411d" xlink:to="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7a81-b364-ea9264c92e43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e3c6a-d082-7df8-9bab-0f320ef116f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7a81-b364-ea9264c92e43" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e3c6a-d082-7df8-9bab-0f320ef116f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7817-8e83-1bfadf79feb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-77c4-a733-d106c7122071" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7817-8e83-1bfadf79feb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7817-8e83-1bfadf79feb9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7817-8e83-1bfadf79feb9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7817-8e83-1bfadf79feb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f71-8f52-0e50eca1ed6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7817-8e83-1bfadf79feb9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f71-8f52-0e50eca1ed6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-7cfc-a147-b562c1b9af44" xlink:href="uti-20260630.xsd#uti_AvondaleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f71-8f52-0e50eca1ed6a" xlink:to="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-7cfc-a147-b562c1b9af44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LisleTermLoanMember_019e3c6a-d082-7b4d-8519-a2457949f6f9" xlink:href="uti-20260630.xsd#uti_LisleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f71-8f52-0e50eca1ed6a" xlink:to="loc_uti_LisleTermLoanMember_019e3c6a-d082-7b4d-8519-a2457949f6f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_FinanceLeasesMember_019e3c6a-d082-70bb-9d7c-66813b231ac8" xlink:href="uti-20260630.xsd#uti_FinanceLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f71-8f52-0e50eca1ed6a" xlink:to="loc_uti_FinanceLeasesMember_019e3c6a-d082-70bb-9d7c-66813b231ac8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_VariableRateComponentAxis_019e3c6a-d082-7e84-9382-9c5a5250aeb9" xlink:href="uti-20260630.xsd#uti_VariableRateComponentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-77c4-a733-d106c7122071" xlink:to="loc_uti_VariableRateComponentAxis_019e3c6a-d082-7e84-9382-9c5a5250aeb9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_VariableRateComponentDomain_019e3c6a-d082-7e84-9382-9c5a5250aeb9_default" xlink:href="uti-20260630.xsd#uti_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_uti_VariableRateComponentAxis_019e3c6a-d082-7e84-9382-9c5a5250aeb9" xlink:to="loc_uti_VariableRateComponentDomain_019e3c6a-d082-7e84-9382-9c5a5250aeb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_VariableRateComponentDomain_019e3c6a-d082-7056-87f7-f98d80a4e9a8" xlink:href="uti-20260630.xsd#uti_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_uti_VariableRateComponentAxis_019e3c6a-d082-7e84-9382-9c5a5250aeb9" xlink:to="loc_uti_VariableRateComponentDomain_019e3c6a-d082-7056-87f7-f98d80a4e9a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_VariableRateComponentOneMember_019e3c6a-d082-7caf-96ad-920d39225ee8" xlink:href="uti-20260630.xsd#uti_VariableRateComponentOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uti_VariableRateComponentDomain_019e3c6a-d082-7056-87f7-f98d80a4e9a8" xlink:to="loc_uti_VariableRateComponentOneMember_019e3c6a-d082-7caf-96ad-920d39225ee8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e3c6a-d082-72b3-91ae-50eb62fb776c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e3c6a-d082-72b3-91ae-50eb62fb776c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e3c6a-d082-7167-8fb2-1d32727da27b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e3c6a-d082-7167-8fb2-1d32727da27b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e3c6a-d082-729f-864b-ffc46e8c60c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e3c6a-d082-729f-864b-ffc46e8c60c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e3c6a-d082-72a6-9e1d-cc30e5f5576a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_LongTermDebt_019e3c6a-d082-72a6-9e1d-cc30e5f5576a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019e3c6a-d082-7bd6-b5be-d28f12477789" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_LongTermDebtCurrent_019e3c6a-d082-7bd6-b5be-d28f12477789" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019e3c6a-d082-7778-a377-8fa107e6e7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019e3c6a-d082-7778-a377-8fa107e6e7bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e3c6a-d082-79fc-b38f-93d752e12c2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e3c6a-d082-79fc-b38f-93d752e12c2e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_DebtInstrumentTrancheRateAdjustmentPercentage_019e3c6a-d082-73a7-8f1e-8a24b6c78f34" xlink:href="uti-20260630.xsd#uti_DebtInstrumentTrancheRateAdjustmentPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7e79-a8b5-907abf1c8a7f" xlink:to="loc_uti_DebtInstrumentTrancheRateAdjustmentPercentage_019e3c6a-d082-73a7-8f1e-8a24b6c78f34" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f32-963c-670d934e4a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f32-963c-670d934e4a1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7f32-963c-670d934e4a1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f32-963c-670d934e4a1b" xlink:to="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7f32-963c-670d934e4a1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7ad3-b112-fb3826cde703" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e3c6a-d082-7f32-963c-670d934e4a1b" xlink:to="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7ad3-b112-fb3826cde703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e3c6a-d082-73e3-9e8b-266dd58cc5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7ad3-b112-fb3826cde703" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e3c6a-d082-73e3-9e8b-266dd58cc5c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019e3c6a-d082-7437-bcbe-a62f5de8c9bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e3c6a-d082-7ad3-b112-fb3826cde703" xlink:to="loc_us-gaap_LetterOfCreditMember_019e3c6a-d082-7437-bcbe-a62f5de8c9bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-75a7-a70b-e95bf61659e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-75a7-a70b-e95bf61659e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-75a7-a70b-e95bf61659e0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-75a7-a70b-e95bf61659e0" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-75a7-a70b-e95bf61659e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7bf2-b66c-c546d8bac799" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-75a7-a70b-e95bf61659e0" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7bf2-b66c-c546d8bac799" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_FifthThirdBankMember_019e3c6a-d082-7844-a7d0-f6bcd660e721" xlink:href="uti-20260630.xsd#uti_FifthThirdBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7bf2-b66c-c546d8bac799" xlink:to="loc_uti_FifthThirdBankMember_019e3c6a-d082-7844-a7d0-f6bcd660e721" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_FifthThirdBankNationalAssociationMember_019e3c6a-d082-77fe-8519-9c9335a16713" xlink:href="uti-20260630.xsd#uti_FifthThirdBankNationalAssociationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7bf2-b66c-c546d8bac799" xlink:to="loc_uti_FifthThirdBankNationalAssociationMember_019e3c6a-d082-77fe-8519-9c9335a16713" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_ValleyNationalBankMember_019e3c6a-d082-754f-bdd5-ba5a6a3c6b8e" xlink:href="uti-20260630.xsd#uti_ValleyNationalBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7bf2-b66c-c546d8bac799" xlink:to="loc_uti_ValleyNationalBankMember_019e3c6a-d082-754f-bdd5-ba5a6a3c6b8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-79e1-9e54-24c872f66bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-79e1-9e54-24c872f66bc9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-79e1-9e54-24c872f66bc9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-79e1-9e54-24c872f66bc9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-79e1-9e54-24c872f66bc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7910-a6f4-b488f8cc86f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-79e1-9e54-24c872f66bc9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7910-a6f4-b488f8cc86f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e3c6a-d082-7ec1-bee5-21bc93cce29e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7910-a6f4-b488f8cc86f1" xlink:to="loc_us-gaap_LineOfCreditMember_019e3c6a-d082-7ec1-bee5-21bc93cce29e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019e3c6a-d082-76ab-9188-d21645297f52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7910-a6f4-b488f8cc86f1" xlink:to="loc_us-gaap_SecuredDebtMember_019e3c6a-d082-76ab-9188-d21645297f52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3c6a-d082-7497-8b5d-9a8fd68acba9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_srt_RangeAxis_019e3c6a-d082-7497-8b5d-9a8fd68acba9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d082-7497-8b5d-9a8fd68acba9_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3c6a-d082-7497-8b5d-9a8fd68acba9" xlink:to="loc_srt_RangeMember_019e3c6a-d082-7497-8b5d-9a8fd68acba9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3c6a-d082-7fba-a592-3fed051180ba" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3c6a-d082-7497-8b5d-9a8fd68acba9" xlink:to="loc_srt_RangeMember_019e3c6a-d082-7fba-a592-3fed051180ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3c6a-d082-7063-89ba-7b4c9969d018" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d082-7fba-a592-3fed051180ba" xlink:to="loc_srt_MinimumMember_019e3c6a-d082-7063-89ba-7b4c9969d018" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3c6a-d082-70b1-8962-7451c0039f87" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3c6a-d082-7fba-a592-3fed051180ba" xlink:to="loc_srt_MaximumMember_019e3c6a-d082-70b1-8962-7451c0039f87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e3c6a-d082-7163-9c1f-f9f86f0ea69b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_VariableRateAxis_019e3c6a-d082-7163-9c1f-f9f86f0ea69b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7163-9c1f-f9f86f0ea69b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019e3c6a-d082-7163-9c1f-f9f86f0ea69b" xlink:to="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7163-9c1f-f9f86f0ea69b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7c3d-82e5-eb11db0845e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019e3c6a-d082-7163-9c1f-f9f86f0ea69b" xlink:to="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7c3d-82e5-eb11db0845e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember_019e3c6a-d082-7eec-b620-2f5c4c5bdb0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrimeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7c3d-82e5-eb11db0845e5" xlink:to="loc_us-gaap_PrimeRateMember_019e3c6a-d082-7eec-b620-2f5c4c5bdb0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e3c6a-d082-7474-92f5-5ae5ce63c982" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e3c6a-d082-7c3d-82e5-eb11db0845e5" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e3c6a-d082-7474-92f5-5ae5ce63c982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7611-99ec-dd174beccc0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7f6b-8eb9-2dbca8e14ca5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7611-99ec-dd174beccc0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-724b-b203-fd23e5b55bd4" xlink:href="uti-20260630.xsd#uti_AvondaleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7611-99ec-dd174beccc0c" xlink:to="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-724b-b203-fd23e5b55bd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LisleTermLoanMember_019e3c6a-d082-7e3c-b6fb-3b151477f5ed" xlink:href="uti-20260630.xsd#uti_LisleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7611-99ec-dd174beccc0c" xlink:to="loc_uti_LisleTermLoanMember_019e3c6a-d082-7e3c-b6fb-3b151477f5ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019f34f7-0ccb-7dce-befc-7444d8dcc380" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-73af-88c9-ff401be9f600" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019f34f7-0ccb-7dce-befc-7444d8dcc380" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f34f7-0ccb-7dce-befc-7444d8dcc380_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019f34f7-0ccb-7dce-befc-7444d8dcc380" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f34f7-0ccb-7dce-befc-7444d8dcc380_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f34f7-0ccb-747e-a159-19a60c1dad90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019f34f7-0ccb-7dce-befc-7444d8dcc380" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f34f7-0ccb-747e-a159-19a60c1dad90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019f34f7-22d1-7996-a560-9927fdbcfdfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019f34f7-0ccb-747e-a159-19a60c1dad90" xlink:to="loc_us-gaap_SubsequentEventMember_019f34f7-22d1-7996-a560-9927fdbcfdfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e3c6a-d082-7e07-86ff-32007b839ab2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e3c6a-d082-7e07-86ff-32007b839ab2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LineOfCreditFacilityIncreaseInAdditionalBorrowingCapacity_019e3c6a-d082-726c-b63d-81f014b9e6b6" xlink:href="uti-20260630.xsd#uti_LineOfCreditFacilityIncreaseInAdditionalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_uti_LineOfCreditFacilityIncreaseInAdditionalBorrowingCapacity_019e3c6a-d082-726c-b63d-81f014b9e6b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e3c6a-d082-721c-b83b-69e6feb98596" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e3c6a-d082-721c-b83b-69e6feb98596" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019e3c6a-d082-7ae9-b385-b73501b5788b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019e3c6a-d082-7ae9-b385-b73501b5788b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019e3c6a-d082-70bf-b522-a996fecd657a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019e3c6a-d082-70bf-b522-a996fecd657a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019e3c6a-d082-774b-91e9-a4bad50e55cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019e3c6a-d082-774b-91e9-a4bad50e55cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e3c6a-d082-7104-987b-3cd9b1aeebd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e3c6a-d082-7104-987b-3cd9b1aeebd1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e3c6a-d082-7a80-b232-a25216638583" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e3c6a-d082-7a80-b232-a25216638583" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019e3c6a-d082-795d-b64e-1c73f604ffb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_us-gaap_DebtInstrumentTerm_019e3c6a-d082-795d-b64e-1c73f604ffb8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_DebtInstrumentTrancheRateAdjustmentPercentage_019e3c6a-d082-7fc2-aa5c-61936e68d91d" xlink:href="uti-20260630.xsd#uti_DebtInstrumentTrancheRateAdjustmentPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-7cfd-a2d6-c3635acacc55" xlink:to="loc_uti_DebtInstrumentTrancheRateAdjustmentPercentage_019e3c6a-d082-7fc2-aa5c-61936e68d91d" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DebtDebtMaturitiesDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DebtDebtMaturitiesDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DebtDebtMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-78c4-9e2e-a869a7005639" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-7f92-9a52-7f9406998637" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-78c4-9e2e-a869a7005639" xlink:to="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-7f92-9a52-7f9406998637" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7b88-9b26-707972d00fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e3c6a-d082-7f92-9a52-7f9406998637" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7b88-9b26-707972d00fb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7b88-9b26-707972d00fb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7b88-9b26-707972d00fb7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7b88-9b26-707972d00fb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-75de-8691-e50abdee7568" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7b88-9b26-707972d00fb7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-75de-8691-e50abdee7568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_TermLoanFacilityMember_019e3c6a-d082-7c58-9949-f5b94001d97b" xlink:href="uti-20260630.xsd#uti_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-75de-8691-e50abdee7568" xlink:to="loc_uti_TermLoanFacilityMember_019e3c6a-d082-7c58-9949-f5b94001d97b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_FinanceLeasesMember_019e3c6a-d082-75b9-a340-2b22a4857ab7" xlink:href="uti-20260630.xsd#uti_FinanceLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-75de-8691-e50abdee7568" xlink:to="loc_uti_FinanceLeasesMember_019e3c6a-d082-75b9-a340-2b22a4857ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtByMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e3c6a-d082-78c4-9e2e-a869a7005639" xlink:to="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_019e3c6a-d082-7152-8509-a345625c0900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_019e3c6a-d082-7152-8509-a345625c0900" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_019e3c6a-d082-7dbb-8bf5-64f0d75b3c97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_019e3c6a-d082-7dbb-8bf5-64f0d75b3c97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_019e3c6a-d082-79b1-a758-b8bc87bd68ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_019e3c6a-d082-79b1-a758-b8bc87bd68ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019e3c6a-d082-7934-ab39-8e60a3ce7400" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019e3c6a-d082-7934-ab39-8e60a3ce7400" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LongTermDebtMaturityYearFourAndThereafter_019e3c6a-d082-708c-beaf-24a61afa44b2" xlink:href="uti-20260630.xsd#uti_LongTermDebtMaturityYearFourAndThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_uti_LongTermDebtMaturityYearFourAndThereafter_019e3c6a-d082-708c-beaf-24a61afa44b2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e3c6a-d082-702c-a515-c89a4932bbb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e3c6a-d082-702c-a515-c89a4932bbb6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e3c6a-d082-75dd-b863-9f9bc60e7a92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e3c6a-d082-75dd-b863-9f9bc60e7a92" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e3c6a-d082-77a4-a786-c5dde78a8c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByMaturityAbstract_019e3c6a-d082-79ab-9668-a4c1a7baf338" xlink:to="loc_us-gaap_LongTermDebt_019e3c6a-d082-77a4-a786-c5dde78a8c5b" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DerivativeFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e3c6a-d082-7445-b7b9-e53a6fd3ad0b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-704e-83d4-aadde27ba26a" xlink:href="uti-20260630.xsd#uti_AvondaleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:to="loc_uti_AvondaleTermLoanMember_019e3c6a-d082-704e-83d4-aadde27ba26a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LisleTermLoanMember_019e3c6a-d082-772d-a2e5-fbcf94141cea" xlink:href="uti-20260630.xsd#uti_LisleTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:to="loc_uti_LisleTermLoanMember_019e3c6a-d082-772d-a2e5-fbcf94141cea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AvondaleSwapMember_019e3c6a-d082-7223-b6d5-933481e557a1" xlink:href="uti-20260630.xsd#uti_AvondaleSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:to="loc_uti_AvondaleSwapMember_019e3c6a-d082-7223-b6d5-933481e557a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_LisleSwapMember_019e3c6a-d082-766b-8f4a-48aa988aeffe" xlink:href="uti-20260630.xsd#uti_LisleSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e3c6a-d082-7473-a953-a289fa8e7a7d" xlink:to="loc_uti_LisleSwapMember_019e3c6a-d082-766b-8f4a-48aa988aeffe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-71e0-968b-4fb943b2d1be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-71e0-968b-4fb943b2d1be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-71e0-968b-4fb943b2d1be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-71e0-968b-4fb943b2d1be" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-71e0-968b-4fb943b2d1be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7198-8d57-7336477348d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e3c6a-d082-71e0-968b-4fb943b2d1be" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7198-8d57-7336477348d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019e3c6a-d082-770c-9725-f14731ae0594" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e3c6a-d082-7198-8d57-7336477348d1" xlink:to="loc_us-gaap_SecuredDebtMember_019e3c6a-d082-770c-9725-f14731ae0594" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-7886-b5cc-5645ae9ce4d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-7886-b5cc-5645ae9ce4d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7886-b5cc-5645ae9ce4d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-7886-b5cc-5645ae9ce4d4" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7886-b5cc-5645ae9ce4d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7949-b1d8-5a48a684b213" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3c6a-d082-7886-b5cc-5645ae9ce4d4" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7949-b1d8-5a48a684b213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_FifthThirdBankNationalAssociationMember_019e3c6a-d082-78da-9e28-98a32152511f" xlink:href="uti-20260630.xsd#uti_FifthThirdBankNationalAssociationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3c6a-d082-7949-b1d8-5a48a684b213" xlink:to="loc_uti_FifthThirdBankNationalAssociationMember_019e3c6a-d082-78da-9e28-98a32152511f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7978-92fb-4a0bd12d309c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7978-92fb-4a0bd12d309c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7978-92fb-4a0bd12d309c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7978-92fb-4a0bd12d309c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7978-92fb-4a0bd12d309c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-753d-851c-bf9ab4c09df6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7978-92fb-4a0bd12d309c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-753d-851c-bf9ab4c09df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-7890-ad4c-a83cfff31336" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-753d-851c-bf9ab4c09df6" xlink:to="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-7890-ad4c-a83cfff31336" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-758f-8697-423a67b6dd7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-758f-8697-423a67b6dd7c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-758f-8697-423a67b6dd7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-758f-8697-423a67b6dd7c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-758f-8697-423a67b6dd7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-73ff-acb6-725903f00a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-758f-8697-423a67b6dd7c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-73ff-acb6-725903f00a8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-79ed-bb55-afa05cf06299" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-73ff-acb6-725903f00a8e" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-79ed-bb55-afa05cf06299" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7fd4-a96c-bc74b20c9d49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7cb1-bcb5-c8823eb805f8" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7fd4-a96c-bc74b20c9d49" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7fd4-a96c-bc74b20c9d49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7fd4-a96c-bc74b20c9d49" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7fd4-a96c-bc74b20c9d49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7e9a-bf6b-7edf101a4545" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7fd4-a96c-bc74b20c9d49" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7e9a-bf6b-7edf101a4545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-77fc-8b07-2a3826bab468" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7e9a-bf6b-7edf101a4545" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-77fc-8b07-2a3826bab468" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_DerivativeFixedAmountOfDebtOnInterestRatePercentage_019e3c6a-d082-7e1d-b210-e46abf38e369" xlink:href="uti-20260630.xsd#uti_DerivativeFixedAmountOfDebtOnInterestRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_uti_DerivativeFixedAmountOfDebtOnInterestRatePercentage_019e3c6a-d082-7e1d-b210-e46abf38e369" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e3c6a-d082-751c-9f7c-d0ceced53408" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e3c6a-d082-751c-9f7c-d0ceced53408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019e3c6a-d082-794c-91aa-3a714cc16d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_us-gaap_DebtInstrumentTerm_019e3c6a-d082-794c-91aa-3a714cc16d1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019e3c6a-d082-75ac-942d-a528829bd976" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019e3c6a-d082-75ac-942d-a528829bd976" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e3c6a-d082-7c97-afb5-e5d0818e8d6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-72a5-9135-56e65d0f9611" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e3c6a-d082-7c97-afb5-e5d0818e8d6b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7f8d-aa3f-58447a853376_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7f8d-aa3f-58447a853376_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-75db-b6ca-679bf1db6b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:to="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-75db-b6ca-679bf1db6b69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7140-a3ce-923dfc19aba7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7140-a3ce-923dfc19aba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-789a-a0e4-53f09f449b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-789a-a0e4-53f09f449b4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78b8-a538-56f85f2c12be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78b8-a538-56f85f2c12be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7c8f-a037-0eb9fc5c7c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7c8f-a037-0eb9fc5c7c2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e3c6a-d082-7cb5-ad9e-abbc9ad6ae2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e3c6a-d082-7cb5-ad9e-abbc9ad6ae2e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e3c6a-d082-7019-a14f-d5a19bd2e17a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e3c6a-d082-7019-a14f-d5a19bd2e17a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails_1" xlink:type="simple" xlink:href="uti-20260630.xsd#DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails_1"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DerivativeFinancialInstrumentsFairValueofDerivativeInstrumentsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7f8d-aa3f-58447a853376_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7f8d-aa3f-58447a853376_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7f8d-aa3f-58447a853376" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-75db-b6ca-679bf1db6b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-774b-8f0e-746b4479f79c" xlink:to="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-75db-b6ca-679bf1db6b69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7140-a3ce-923dfc19aba7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-7140-a3ce-923dfc19aba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-7140-a3ce-923dfc19aba7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-789a-a0e4-53f09f449b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-754e-a605-ef224b99fd69" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-789a-a0e4-53f09f449b4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-7bcf-ae8f-b61882d213da" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78b8-a538-56f85f2c12be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78b8-a538-56f85f2c12be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78b8-a538-56f85f2c12be" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7c8f-a037-0eb9fc5c7c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7b0e-807c-8764855f1e0d" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7c8f-a037-0eb9fc5c7c2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e3c6a-d082-7019-a14f-d5a19bd2e17a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-748b-9b6b-bfea1afbcd80" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e3c6a-d082-7019-a14f-d5a19bd2e17a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/DerivativeFinancialInstrumentsAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#DerivativeFinancialInstrumentsAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/DerivativeFinancialInstrumentsAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-7675-b4f1-c50fd5886c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-700a-9c28-c1f2fa73cbbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-7675-b4f1-c50fd5886c6f" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-700a-9c28-c1f2fa73cbbb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7176-bc5b-47df6e28f4fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-700a-9c28-c1f2fa73cbbb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7176-bc5b-47df6e28f4fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7176-bc5b-47df6e28f4fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7176-bc5b-47df6e28f4fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-7176-bc5b-47df6e28f4fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-79cf-98e5-b225f54a439d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3c6a-d082-7176-bc5b-47df6e28f4fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-79cf-98e5-b225f54a439d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-74f6-b5ec-0c0b206339e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3c6a-d082-79cf-98e5-b225f54a439d" xlink:to="loc_us-gaap_InterestRateSwapMember_019e3c6a-d082-74f6-b5ec-0c0b206339e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78ff-a362-0216a24bdd20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-700a-9c28-c1f2fa73cbbb" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78ff-a362-0216a24bdd20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78ff-a362-0216a24bdd20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78ff-a362-0216a24bdd20" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-78ff-a362-0216a24bdd20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7da3-90c5-6f3bf491643d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e3c6a-d082-78ff-a362-0216a24bdd20" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7da3-90c5-6f3bf491643d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7734-bb0e-a823be013639" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e3c6a-d082-7da3-90c5-6f3bf491643d" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e3c6a-d082-7734-bb0e-a823be013639" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-756b-b3e3-0916df4dff55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019e3c6a-d082-700a-9c28-c1f2fa73cbbb" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-756b-b3e3-0916df4dff55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-756b-b3e3-0916df4dff55_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-756b-b3e3-0916df4dff55" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-756b-b3e3-0916df4dff55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-758e-b6fa-8498f3821368" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e3c6a-d082-756b-b3e3-0916df4dff55" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-758e-b6fa-8498f3821368" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-7a32-95ef-f93d7ae204c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e3c6a-d082-758e-b6fa-8498f3821368" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e3c6a-d082-7a32-95ef-f93d7ae204c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e3c6a-d082-7bdc-b4df-09acb82f4c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-7675-b4f1-c50fd5886c6f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e3c6a-d082-7bdc-b4df-09acb82f4c5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e3c6a-d082-70cf-90cd-35eb139f8c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019e3c6a-d082-7675-b4f1-c50fd5886c6f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e3c6a-d082-70cf-90cd-35eb139f8c1d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/RestructuringChargesDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#RestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/RestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e3c6a-d082-7909-8887-43c2a6108c1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e3c6a-d082-716f-aa30-d400a4a49630" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e3c6a-d082-7909-8887-43c2a6108c1b" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e3c6a-d082-716f-aa30-d400a4a49630" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019e3c6a-d082-7e4d-a0cb-18d3f41270f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e3c6a-d082-716f-aa30-d400a4a49630" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019e3c6a-d082-7e4d-a0cb-18d3f41270f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-7e4d-a0cb-18d3f41270f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e3c6a-d082-7e4d-a0cb-18d3f41270f7" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-7e4d-a0cb-18d3f41270f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-70e6-bd16-14482da0d4d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e3c6a-d082-7e4d-a0cb-18d3f41270f7" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-70e6-bd16-14482da0d4d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_EducationalServicesAndFacilitiesExpenseMember_019f88b9-48d0-72c8-a533-15a8c1977335" xlink:href="uti-20260630.xsd#uti_EducationalServicesAndFacilitiesExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-70e6-bd16-14482da0d4d3" xlink:to="loc_uti_EducationalServicesAndFacilitiesExpenseMember_019f88b9-48d0-72c8-a533-15a8c1977335" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_SellingGeneralAndAdministrativeExpenseMember_019f88b9-d5a2-7e59-b5d9-0a449e5e2654" xlink:href="uti-20260630.xsd#uti_SellingGeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e3c6a-d082-70e6-bd16-14482da0d4d3" xlink:to="loc_uti_SellingGeneralAndAdministrativeExpenseMember_019f88b9-d5a2-7e59-b5d9-0a449e5e2654" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019fa5b3-8e50-729f-ae87-0d0615f4b1ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e3c6a-d082-716f-aa30-d400a4a49630" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019fa5b3-8e50-729f-ae87-0d0615f4b1ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fa5b3-8e50-729f-ae87-0d0615f4b1ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019fa5b3-8e50-729f-ae87-0d0615f4b1ad" xlink:to="loc_us-gaap_SegmentDomain_019fa5b3-8e50-729f-ae87-0d0615f4b1ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fa5b3-8e50-75d5-8691-9873b80a67bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019fa5b3-8e50-729f-ae87-0d0615f4b1ad" xlink:to="loc_us-gaap_SegmentDomain_019fa5b3-8e50-75d5-8691-9873b80a67bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_UTIMember_019fa5b4-9087-7001-aece-84e20a1a1bcb" xlink:href="uti-20260630.xsd#uti_UTIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019fa5b3-8e50-75d5-8691-9873b80a67bd" xlink:to="loc_uti_UTIMember_019fa5b4-9087-7001-aece-84e20a1a1bcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_ConcordeMember_019fa5b4-e789-7bd2-81d0-66b3a6279b7d" xlink:href="uti-20260630.xsd#uti_ConcordeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019fa5b3-8e50-75d5-8691-9873b80a67bd" xlink:to="loc_uti_ConcordeMember_019fa5b4-e789-7bd2-81d0-66b3a6279b7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019fa5b5-2e83-719a-b1e9-d230a9f5bb48" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e3c6a-d082-716f-aa30-d400a4a49630" xlink:to="loc_srt_ConsolidationItemsAxis_019fa5b5-2e83-719a-b1e9-d230a9f5bb48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019fa5b5-2e83-719a-b1e9-d230a9f5bb48_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019fa5b5-2e83-719a-b1e9-d230a9f5bb48" xlink:to="loc_srt_ConsolidationItemsDomain_019fa5b5-2e83-719a-b1e9-d230a9f5bb48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019fa5b5-2e83-7c12-b1cb-b83913465a16" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019fa5b5-2e83-719a-b1e9-d230a9f5bb48" xlink:to="loc_srt_ConsolidationItemsDomain_019fa5b5-2e83-7c12-b1cb-b83913465a16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019fa5b5-5df9-719c-9ba4-cae141ebf9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019fa5b5-2e83-7c12-b1cb-b83913465a16" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019fa5b5-5df9-719c-9ba4-cae141ebf9a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019f88b6-683e-7e0d-a42b-29e3085c2bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e3c6a-d082-7909-8887-43c2a6108c1b" xlink:to="loc_us-gaap_RestructuringCharges_019f88b6-683e-7e0d-a42b-29e3085c2bb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019fc416-0031-7f07-bd02-1b813db0561c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e3c6a-d082-7909-8887-43c2a6108c1b" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019fc416-0031-7f07-bd02-1b813db0561c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/SegmentInformationDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3c6a-d082-755b-99d9-b9e3567362ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3c6a-d082-755b-99d9-b9e3567362ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e3c6a-d082-702d-81f3-9f4471349ba7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3c6a-d082-755b-99d9-b9e3567362ed" xlink:to="loc_srt_ConsolidationItemsAxis_019e3c6a-d082-702d-81f3-9f4471349ba7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-702d-81f3-9f4471349ba7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e3c6a-d082-702d-81f3-9f4471349ba7" xlink:to="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-702d-81f3-9f4471349ba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-76b8-9d6c-c08540d1c61a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e3c6a-d082-702d-81f3-9f4471349ba7" xlink:to="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-76b8-9d6c-c08540d1c61a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e3c6a-d082-723b-ba74-de0f99360ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-76b8-9d6c-c08540d1c61a" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e3c6a-d082-723b-ba74-de0f99360ce0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e3c6a-d082-78f3-8a88-361167963bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e3c6a-d082-76b8-9d6c-c08540d1c61a" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e3c6a-d082-78f3-8a88-361167963bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3c6a-d082-755b-99d9-b9e3567362ed" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56" xlink:to="loc_us-gaap_SegmentDomain_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3c6a-d082-7668-b122-ac0b62eb3e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3c6a-d082-70f8-ad8c-7ffff0c9ff56" xlink:to="loc_us-gaap_SegmentDomain_019e3c6a-d082-7668-b122-ac0b62eb3e8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_UTIMember_019e3c6a-d082-7b32-92ef-f55d5004ded1" xlink:href="uti-20260630.xsd#uti_UTIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3c6a-d082-7668-b122-ac0b62eb3e8a" xlink:to="loc_uti_UTIMember_019e3c6a-d082-7b32-92ef-f55d5004ded1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_ConcordeMember_019e3c6a-d082-7f2a-8667-27b7b8afbc00" xlink:href="uti-20260630.xsd#uti_ConcordeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3c6a-d082-7668-b122-ac0b62eb3e8a" xlink:to="loc_uti_ConcordeMember_019e3c6a-d082-7f2a-8667-27b7b8afbc00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e3c6a-d082-7274-aac9-c09fb2df5fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e3c6a-d082-7274-aac9-c09fb2df5fcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e3c6a-d082-7330-9c96-60dd07727548" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e3c6a-d082-7330-9c96-60dd07727548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_019e3c6a-d082-7ee0-a70c-f9afbfcc0cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_019e3c6a-d082-7ee0-a70c-f9afbfcc0cbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_019e3c6a-d082-7de2-8699-68e548d8f98d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_AdvertisingExpense_019e3c6a-d082-7de2-8699-68e548d8f98d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_019e3c6a-d082-7b2f-b6a9-d927e190fba4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OccupancyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_OccupancyNet_019e3c6a-d082-7b2f-b6a9-d927e190fba4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_StudentRelatedExpense_019e3c6a-d082-71e1-8f8c-0a39aeec3615" xlink:href="uti-20260630.xsd#uti_StudentRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_uti_StudentRelatedExpense_019e3c6a-d082-71e1-8f8c-0a39aeec3615" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_GeneralOperationsExpense_019e3c6a-d082-7bb6-9e59-81961e7c8ff2" xlink:href="uti-20260630.xsd#uti_GeneralOperationsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_uti_GeneralOperationsExpense_019e3c6a-d082-7bb6-9e59-81961e7c8ff2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e3c6a-d082-722e-a074-0bd51fd126e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e3c6a-d082-722e-a074-0bd51fd126e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalAndContractServicesExpense_019e3c6a-d082-7e0b-857b-7d2b3cffd287" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalAndContractServicesExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_ProfessionalAndContractServicesExpense_019e3c6a-d082-7e0b-857b-7d2b3cffd287" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_019e3c6a-d082-7667-84e1-cdb250bf9947" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_OtherExpenses_019e3c6a-d082-7667-84e1-cdb250bf9947" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_CorporateSupportExpense_019e3c6a-d082-76d5-b26b-5a93ef1ea5e8" xlink:href="uti-20260630.xsd#uti_CorporateSupportExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_uti_CorporateSupportExpense_019e3c6a-d082-76d5-b26b-5a93ef1ea5e8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e3c6a-d082-7de9-b43e-a18d960e5d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_OperatingExpenses_019e3c6a-d082-7de9-b43e-a18d960e5d0f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019e3c6a-d082-78e3-86d4-27fce55d0405" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_OperatingIncomeLoss_019e3c6a-d082-78e3-86d4-27fce55d0405" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e3c6a-d082-7845-a221-7de941b2c558" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_NetIncomeLoss_019e3c6a-d082-7845-a221-7de941b2c558" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e3c6a-d082-732d-b0ed-1b33de856808" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3c6a-d082-7f51-b951-3dcb6585cc2b" xlink:to="loc_us-gaap_Assets_019e3c6a-d082-732d-b0ed-1b33de856808" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.uti.edu/role/GovernmentRegulationandFinancialAidDetails" xlink:type="simple" xlink:href="uti-20260630.xsd#GovernmentRegulationandFinancialAidDetails"/>
  <link:definitionLink xlink:role="http://www.uti.edu/role/GovernmentRegulationandFinancialAidDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemLineItems_019e3c6a-d082-755d-a03a-e25cf8a7bdbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnusualOrInfrequentItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemTable_019e3c6a-d082-7ade-a3ae-6b52598c70da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnusualOrInfrequentItemTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_019e3c6a-d082-755d-a03a-e25cf8a7bdbd" xlink:to="loc_us-gaap_UnusualOrInfrequentItemTable_019e3c6a-d082-7ade-a3ae-6b52598c70da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AccreditationTypeAxis_019e3c6a-d082-79d6-8890-d9fddcc29d76" xlink:href="uti-20260630.xsd#uti_AccreditationTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_019e3c6a-d082-7ade-a3ae-6b52598c70da" xlink:to="loc_uti_AccreditationTypeAxis_019e3c6a-d082-79d6-8890-d9fddcc29d76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AccreditationTypeDomain_019e3c6a-d082-79d6-8890-d9fddcc29d76_default" xlink:href="uti-20260630.xsd#uti_AccreditationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_uti_AccreditationTypeAxis_019e3c6a-d082-79d6-8890-d9fddcc29d76" xlink:to="loc_uti_AccreditationTypeDomain_019e3c6a-d082-79d6-8890-d9fddcc29d76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AccreditationTypeDomain_019e3c6a-d082-77da-9cd6-a713f9753a5a" xlink:href="uti-20260630.xsd#uti_AccreditationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_uti_AccreditationTypeAxis_019e3c6a-d082-79d6-8890-d9fddcc29d76" xlink:to="loc_uti_AccreditationTypeDomain_019e3c6a-d082-77da-9cd6-a713f9753a5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_AccreditingCommissionOfCareerSchoolAndCollegesMember_019e3c6a-d082-73cd-aa0a-6d713d923218" xlink:href="uti-20260630.xsd#uti_AccreditingCommissionOfCareerSchoolAndCollegesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uti_AccreditationTypeDomain_019e3c6a-d082-77da-9cd6-a713f9753a5a" xlink:to="loc_uti_AccreditingCommissionOfCareerSchoolAndCollegesMember_019e3c6a-d082-73cd-aa0a-6d713d923218" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_CouncilOnOccupationalEducationMember_019e3c6a-d082-79d9-87f2-8165be974353" xlink:href="uti-20260630.xsd#uti_CouncilOnOccupationalEducationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uti_AccreditationTypeDomain_019e3c6a-d082-77da-9cd6-a713f9753a5a" xlink:to="loc_uti_CouncilOnOccupationalEducationMember_019e3c6a-d082-79d9-87f2-8165be974353" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e3c6a-d082-7b26-915c-29a4d47d81b7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_019e3c6a-d082-7ade-a3ae-6b52598c70da" xlink:to="loc_dei_LegalEntityAxis_019e3c6a-d082-7b26-915c-29a4d47d81b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e3c6a-d082-7b26-915c-29a4d47d81b7_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e3c6a-d082-7b26-915c-29a4d47d81b7" xlink:to="loc_dei_EntityDomain_019e3c6a-d082-7b26-915c-29a4d47d81b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e3c6a-d082-7b2f-9cd2-3a65fefced78" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e3c6a-d082-7b26-915c-29a4d47d81b7" xlink:to="loc_dei_EntityDomain_019e3c6a-d082-7b2f-9cd2-3a65fefced78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_ConcordeCareerCollegesIncMember_019e3c6a-d082-71df-9ec7-5be1b8ab235f" xlink:href="uti-20260630.xsd#uti_ConcordeCareerCollegesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e3c6a-d082-7b2f-9cd2-3a65fefced78" xlink:to="loc_uti_ConcordeCareerCollegesIncMember_019e3c6a-d082-71df-9ec7-5be1b8ab235f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_NumberOfAccreditedInstitutions_019e3c6a-d082-716b-90c5-ba4baeb5e9cf" xlink:href="uti-20260630.xsd#uti_NumberOfAccreditedInstitutions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_019e3c6a-d082-755d-a03a-e25cf8a7bdbd" xlink:to="loc_uti_NumberOfAccreditedInstitutions_019e3c6a-d082-716b-90c5-ba4baeb5e9cf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_LongTermDebtCurrent" xlink:type="arc" order="41"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.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/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_uti_RobertT.DeVincenziMember_019e3c6a-ce1e-725b-8205-aecbb57c6f1e" xlink:href="uti-20260630.xsd#uti_RobertT.DeVincenziMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_uti_RobertT.DeVincenziMember_019e3c6a-ce1e-725b-8205-aecbb57c6f1e" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
