FindLaw Legal Dictionary
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: extending in scope or effect to a prior time or to conditions that existed or originated in the past
: made effective as of a date prior to enactment, promulgation, or imposition [a tax] see also ex post facto law
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.