<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Wed Aug 26 21:05:09 UTC 2026 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/>
  <definitionLink xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <loc xlink:type="locator" xlink:label="mctmf_S000005281Member" xlink:href="mctmf-20251031.xsd#mctmf_S000005281Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="mctmf_S000005281Member" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="mctmf_S000005285Member" xlink:href="mctmf-20251031.xsd#mctmf_S000005285Member"/>
<!-- [WMV7][W4HAsrbJaT+BF6F3sEZFyTJb8wQWK2U20KNKle2/XK6r6jaiesRJJbgTa9vufPbOawHJiS0HUQQ3aBHYVmA7+pe3NNsq7le9HLbJMP+wxiFBRrKZ2uGh8myXi31xDiCZR10N4QdY8E85CDUV+/8nlar3GR7gDbGQjctwV0UPpLYrAWSPRToQx2sX7bBjxALSbhnEarSp/fJ0OnU/K6npHolWQcS5GPHl3+rU2cdnFJJIXTS1ZD1PZ7JCgMbBOue/BGmVrmD+GjFf3YGdm8YGZW5xK5Zhh1h9HBUWefAlEpwSJFrPUnVFMkw6R+z6Vi8GQrBz2Uak3QJ98d+EZOrcK3K5V+uwEL5qndqELyL9c50aaLEZnbRbdzC5ov0U] CSR-->
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="mctmf_S000005285Member" order="12" xbrldt:closed="true"/>
  </definitionLink>
</linkbase>
