To make active or to activate; to bring into a state of activity or function.
From 'active' + '-ize' (suffix meaning 'to cause to become'). A less common variant of 'activate,' following similar word-building patterns.
While 'activate' is more common, 'activize' shows how English loves creating alternatives—you could 'activate' your plan or 'activize' it, though activate has basically won out in modern usage.
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