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Definition of retroactive adjective from the Oxford Advanced Learner's Dictionary

retroactive

adjective
 
/ˌretrəʊˈæktɪv/
 
/ˌretrəʊˈæktɪv/
(formal)
(also more frequent retrospective)
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  1. (of a new law or decision) intended to take effect from a particular date in the past rather than from the present date
See retroactive in the Oxford Advanced American Dictionary

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