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English definition of “mastermind”

mastermind

verb [T]     /ˈmɑː.stə.maɪnd/ US  /ˈmæs.tɚ-/
to plan a difficult activity, often a crime, in detail and make certain that it happens successfully: He's believed to have masterminded the attacks.Planning, expecting and arrangingPlotting and trapping mastermind     noun [C] a criminal mastermindPlanning, expecting and arrangingPlotting and trapping
(Definition of mastermind verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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