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English definition of “pre-emptive”

pre-emptive

adjective uk   /ˌpriːˈemp.tɪv/ formal us  
describes something that is done before other people can act, especially to prevent them from doing something else: The Treasury has decided to raise interest rates as a pre-emptive measure against inflation. The prime minister authorized a pre-emptive air strike against the rebels.Unhelpful and Uncooperative
(Definition of pre-emptive from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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