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post factum

[pohst fak-tuh m]
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adjective, adverb
  1. after the fact; ex post facto: She will announce her decision and then give us a post factum statement of the reasons for it.
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Origin of post factum

1685–95; < Latin: after (the) deed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for post factum

Latin, literally "after the fact."

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Online Etymology Dictionary, © 2010 Douglas Harper