Definitions for: Retroactive

[adj] affecting things past; "retroactive tax increase"; "an ex-post-facto law"; "retro pay"
[adj] (psychology) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously

Webster (1913) Definition: Re`tro*act"ive, a. [Cf. F. r['e]troactif.]
Fitted or designed to retroact; operating by returned action;
affecting what is past; retrospective. --Beddoes.

Retroactive law or 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.

Synonyms: ex post facto, retro, retrospective

Antonyms: proactive

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