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retroactive

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adjective ret·ro·ac·tive \-ˈak-tiv\

Simple Definition of retroactive

  • : effective from a particular date in the past

Full Definition of retroactive

  1. :  extending in scope or effect to a prior time or to conditions that existed or originated in the past; especially :  made effective as of a date prior to enactment, promulgation, or imposition <retroactive tax>

ret·ro·ac·tive·ly adverb
ret·ro·ac·tiv·i·ty play \-ˌak-ˈti-və-tē\ noun

Examples of retroactive

  1. They all received a retroactive pay raise.

  2. The new tax will be retroactive to January 1.



Origin of retroactive

French rétroactif, from Latin retroactus, past participle of retroagere to drive back, reverse, from retro- + agere to drive — more at agent


First Known Use: 1611


Medical Dictionary

retroactive

play
adjective ret·ro·ac·tive \ˌre-trō-ˈak-tiv\

Medical Definition of retroactive

  1. :  having relation or reference to or efficacy in a prior time; specifically :  relating to, caused by, or being obliteration of the results of learning by immediately subsequent activity <retroactive inhibition>





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