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The Collaborative International Dictionary
Retroactive statute

Retroactive \Re`tro*act"ive\, a. [Cf. F. r['e]troactif.] Fitted or designed to retroact; operating by returned action; affecting what is past; retrospective.

Retroactive law or Retroactive statute (Law), one which operates to make criminal or punishable, or in any way expressly to affect, acts done prior to the passing of the law.