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English definition of “retroactive”

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retroactive

adjective uk   /ˌret.rəʊˈæk.tɪv/ us    /-roʊ-/ ( also retrospective) formal
If a law or decision, etc. is retroactive, it has effect from a date before it was approved: the first British law to have retroactive effect
retroactively
adverb uk   /-li/ us  
The courts cannot apply a new rule retroactively.
Translations of “retroactive”
in Chinese (Traditional) 有追溯效力的, 溯及既往的…
in Chinese (Simplified) 有追溯效力的, 溯及既往的…
(Definition of retroactive from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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