retroaction Hear it!

retroaction definition

retro·ac·tion (-ak′s̸hən)

noun

  1. opposed, reverse, or reciprocal action; reaction

  2. Etymology: retroact + -ion

    effect, as of a law, on things done prior to its enactment or effectuation

Etymology: retro- + action

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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