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English definition of “retroactive”

retroactive

adjective [not gradable]    /ˌre·troʊˈæk·tɪv/
(of a law or other agreement) having effect from the time before the law or agreement was approved: I’m getting a retroactive salary increase. retroactively    /ˌre·troʊˈæk·tɪv·li/ adverb [not gradable] The courts cannot apply a new rule retroactively.
(Definition of retroactive adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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