ex post facto

• Terme juridique latin signifiant « après coup », désignant une loi ou une action qui modifie rétroactivement les conséquences juridiques d'actes commis avant son adoption, ou un effet qui s'applique à des faits antérieurs à sa promulgation.

A Latin legal term meaning 'after the fact,' used to describe a law or action that retroactively changes the legal consequences of acts committed before the law was enacted.

1. Retroactive effectC2formal

   Describing a law or action that applies to events that occurred before its enactment.

   effet rétroactif

   • The court ruled that the ex post facto law was unconstitutional.
   • Ex post facto legislation is prohibited in many legal systems.
   • The new regulation cannot be applied ex post facto to past transactions.