<?xml version="1.0" encoding="UTF-8"?>
<!--(C) EIOPA - XBRL Taxonomy-->
<?officialURI http://eiopa.europa.eu/eu/xbrl/s2c/dict/dom/ca/mem-def.xml?>
<?taxonomy-version 2.6.0?>
<?taxonomy-date 2021-07-15?>
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" 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 http://xbrl.org/2005/xbrldt http://www.xbrl.org/2005/xbrldt-2005.xsd">
  <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:definitionLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:loc xlink:type="locator" xlink:href="../exp.xsd#s2c_CA" xlink:label="loc_s2c_CA" />
    <link:loc xlink:type="locator" xlink:href="mem.xsd#s2c_x0" xlink:label="loc_s2c_x0" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_s2c_CA" xlink:to="loc_s2c_x0" order="1" />
    <link:loc xlink:type="locator" xlink:href="mem.xsd#s2c_x1" xlink:label="loc_s2c_x1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_s2c_CA" xlink:to="loc_s2c_x1" order="2" />
  </link:definitionLink>
</link:linkbase>