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English definition of “activate”

activate

verb [T] uk   /ˈæk.tɪ.veɪt/ us  
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
noun [U] uk   /ˌæk.tɪˈveɪ.ʃən/ us  
Causing things to happen
(Definition of activate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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