Dictionary

1ex post facto

adverb ex post fac·to \ˌeks-ˌpōs(t)-ˈfak-(ˌ)tō\

Definition of EX POST FACTO

:  after the fact :  retroactively
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Origin of EX POST FACTO

Late Latin, literally, from a thing done afterward
First Known Use: 1621

2ex post facto

adjective

Definition of EX POST FACTO

:  done, made, or formulated after the fact :  retroactive <ex post facto approval> <ex post facto laws>

First Known Use of EX POST FACTO

1787

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