Etymology
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ex post facto

from Medieval Latin ex postfacto, "from what is done afterwards." From facto, ablative of factum "deed, act" (see fact). Also see ex-, post-.

updated on September 20, 2014

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Definitions of ex post facto from WordNet

ex post facto (adj.)
affecting things past;
Synonyms: retroactive / retro
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.