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English definition of “activate”

activate

verb [T]     /ˈæk.tɪ.veɪt/
to cause something to start: The alarm is activated by the lightest pressure.Causing things to happen specialized chemistry to make a chemical reaction happen more quickly, especially by heatingPhysical and chemical processes activation     /ˌæk.tɪˈveɪ.ʃən/ noun [U] Causing things to happen
(Definition of activate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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