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Meaning of “mastermind” in the English Dictionary

"mastermind" in American English

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mastermindverb [T]

us   /ˈmæs·tərˌmɑɪnd/
to plan and direct a difficult activity: Oliver masterminded the takeover of his top business competitor.
noun [C] us   /ˈmæs·tərˌmɑɪnd/
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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“mastermind” in British English

“mastermind” in American English

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