ex post facto

[ eks pohst fak-toh ]

adverb

1. from or by subsequent action; retroactively; subsequently; retrospectively.

adjective

1. having retroactive force; made or done subsequently:

   an ex post facto law.

ex post facto

/ ɛks pəʊst ˈfæktəʊ /

adjective

1. having retrospective effect

   an ex post facto law

ex post facto

¹

1. A descriptive term for an explanation or a law that is made up after an event and then applied to it: “The chairman's description of his plan sounds like an ex post facto attempt to justify an impulsive action.” Ex post facto is Latin for “from after the deed.”

ex post facto

²

1. An explanation or regulation concocted after the event, sometimes misleading or unjust: “Your ex post facto defense won't stand up in court.” ( See ex post facto law .) From Latin , meaning “after the deed.”

Word History and Origins

Origin of ex post facto¹

First recorded in 1625–35; from Latin: “from a thing done afterward, from what is done afterward”

Word History and Origins

Origin of ex post facto¹

C17: from Latin ex from + post afterwards + factus done, from facere to do

Example Sentences

But it was only when Adams encouraged Smith of the Los Angeles Philharmonic to take a look at the score, and Mattingly began to send along recorded clips, that “Stranger Love,” long finished, was ex post facto commissioned by the Philharmonic for a staged production.

From New York Times

As for the claim of ex post facto justice, Robert Jackson — the American prosecutor who believed aggression enabled all the other war crimes that followed — summed up the charge:

From Salon

“This is a violation of the ex post facto clause of the constitution,” said Neama Rahmani, president of West Coast Trial Lawyers.

From Washington Times

As for the claim of ex post facto justice, Robert Jackson — the American prosecutor who believed aggression enabled all the other war crimes that followed — summed up the charge:

From Salon

As anyone who’s ever seen a horror movie knows, ex post facto explanations of the monster’s pathology are beside the point.

From Washington Post