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Adjective
having retrospective effect [Latin ex from + post afterwards + factus done]
Collins Essential English Dictionary 2nd Edition 2006 © HarperCollins Publishers 2004, 2006
No State shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; emit bills of credit; make any thing but gold and silver a legal tender in payment of debts; pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts; or grant any title of nobility.
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