One of the mysteries of the English language finally explained.
Occurring, made, or enacted after the event; done with hindsight.
= post factum.
Late 16th century; earliest use found in George Whetstone (d. 1587), writer. From classical Latin postfacto. With use as adjective compare later post-fact, post factum. With use as adverb compare slightly earlier post factum.
post facto/ˌpəʊs(t) ˈfaktəʊ/
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