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Definition of activation noun from the Oxford Advanced Learner's Dictionary

activation

noun
 
 
/ˌæktɪˈveɪʃn/
 
/ˌæktɪˈveɪʃn/
[uncountable]
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  1. the act of making something such as a device or chemical process start working
    • The activation of several target genes results in two major effects.
    • to trigger/inhibit/block the activation of something
    Topics Engineeringc1, Physics and chemistryc1
See activation in the Oxford Learner's Dictionary of Academic English
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