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English definition of “proactive”

proactive

adjective     /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 / role Efficient and effective proactively     /-li/ adverb Efficient and effective
(Definition of proactive adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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