American English

Definition of mastermind noun from the Oxford Advanced American Dictionary

 

mastermind

 noun
noun
NAmE//ˈmæstərˌmaɪnd//
 
[usually singular]
 
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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.
See the Oxford Advanced Learner's Dictionary entry: mastermind

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