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Meaning of ex post facto

ex post fac•to

Pronunciation: (eks' pōst" fak'tō), [key]
  1. from or by subsequent action; subsequently; retrospectively; retroactively.
  2. having retroactive force; made or done subsequently: an ex post facto law.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.