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

 

mastermind

 noun
noun
BrE BrE//ˈmɑːstəmaɪnd//
 
; NAmE NAmE//ˈmæstərmaɪnd//
 
Clever
 
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[usually singular] an intelligent person who plans and directs a complicated project or activity (often one that involves a crime) The mastermind behind the robbery was never caught. There’s a criminal mastermind behind all this. See related entries: Clever
See the Oxford Advanced American Dictionary entry: mastermind

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