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English definition of “mastermind”

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verb [T]  /ˈmæs·tərˌmɑɪnd/ us  
to plan and direct a difficult activity: Oliver masterminded the takeover of his top business competitor.
noun [C]  /ˈmæs·tərˌmɑɪnd/ us  
The mastermind behind the escape has never been identified.
(Definition of mastermind from the Cambridge Academic Content Dictionary © Cambridge University Press)
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