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English definition of “proactive”

proactive

adjective uk   /ˌprəʊˈæk.tɪv/ us    /ˌproʊ-/
taking action by causing change and not only reacting to change when it happens: Companies are going to have to be more proactive about environmental management. a proactive approach/roleEfficient and effective
proactively
adverb uk   /-li/ us  
Efficient and effective
(Definition of proactive from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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