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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ret·ro·ac·tive /-ˈæktɪv/
 (a.)反動的,追溯的,有追溯力的

From: Webster's Revised Unabridged Dictionary (1913)

 Re·tro·act·ive a.  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.
 

From: WordNet (r) 2.0

 retroactive
      adj 1: descriptive of any event or stimulus or process that has an
             effect on the effects of events or stimuli or process
             that occurred previously [ant: proactive]
      2: affecting things past; "retroactive tax increase"; "an
         ex-post-facto law"; "retro pay" [syn: ex post facto, retro]