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Reference.org
Ab initio
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<p> <i>Ab initio</i> is a Latin term meaning "from the beginning" and is derived from the Latin <i>ab</i> ("from") + <i>initio</i>, <a href="/facts/Ablative_case/GotGMD3k">ablative</a> <a href="/facts/Grammatical_number/zzs5AV6v">singular</a> of <i>initium</i> ("beginning"). </p>