mastermind Meaning in the Cambridge English Dictionary
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Meaning of “mastermind” in the English Dictionary

"mastermind" in British English

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mastermindverb [T]

uk   /ˈmɑː.stə.maɪnd/  us   /ˈmæs.tɚ-/
to ​plan a ​difficultactivity, often a ​crime, in ​detail and make ​certain that it ​happenssuccessfully: He's ​believed to have masterminded the ​attacks.
mastermind
noun [C] uk   us  
a ​criminal mastermind
(Definition of mastermind from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mastermind" in American English

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mastermindverb [T]

 us   /ˈmæs·tərˌmɑɪnd/
to ​plan and ​direct a ​difficultactivity: Oliver masterminded the ​takeover of his ​topbusinesscompetitor.
mastermind
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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