A Posteriori Definition
From what comes after. Inductive; empirical; reasoning or the ascertaining of truth by actual experience or observation. See also a priori.
Origin of A Posteriori
Medieval Latin ā posteriōrī Latin ā from Latin posteriōrī ablative of posterior later
From American Heritage Dictionary of the English Language, 5th Edition
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L, lit., from what comes later < a, ab, from + posteriori, abl. of posterior: see posterior
From Webster's New World College Dictionary, 5th Edition
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From Latin a posteriori (“latter”), literally “from the latter”.
From Wiktionary