retroact Hear it!

retroact definition

retro·act (re′trō akt′)

intransitive verb

  1. to act in opposition; react
  2. to have reference to or influence on things done in the past

Etymology: < L retroactus, pp. of retroagere, to drive back, reverse < retro- + agere, to act

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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