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Adjective: retroactive  ,re-trow'ak-tiv
  1. (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
     
  2. Affecting things past
    "retroactive tax increase";
    - ex post facto, retro

See also: retrospective

Antonym: proactive

Encyclopedia: Retroactive

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retroflexion