Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of retroact is as below...

Retrospective :: Retrospective (a.) Having reference to what is past; affecting things past; retroactive; as, a retrospective law..

Retroaction :: Retroaction (n.) Operation on something past or preceding.

Reflex :: Reflex (a.) Directed back; attended by reflection; retroactive; introspective.

Retroaction :: Retroaction (n.) Action returned, or action backward..

Retro- :: Retro- () A prefix or combining form signifying backward, back; as, retroact, to act backward; retrospect, a looking back..

Retroact :: Retroact (v. i.) To act backward, or in return; to act in opposition; to be retrospective..

Retroactive :: Retroactive (a.) Fitted or designed to retroact; operating by returned action; affecting what is past; retrospective.

Retroactively :: Retroactively (adv.) In a retroactive manner.

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