mastermind

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈmɑːstərmaɪnd/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈmæstɚˌmaɪnd/

US:USA pronunciation: respellingUSA pronunciation: respelling(mastər mīnd′, mästər-)



WordReference Random House Learner's Dictionary of American English © 2026
mas•ter•mind /ˈmæstɚˌmaɪnd/USA pronunciation   v. 
    [+ object]
  1. to plan and direct skillfully:to mastermind the theft.

n. [countable]
  1. one who is responsible for the performance of a project:a mastermind behind the plot.

WordReference Random House Unabridged Dictionary of American English © 2026
mas•ter•mind  (mastər mīnd′, mästər-),USA pronunciation v.t. 
  1. to plan and direct (a usually complex project or activity), esp. skillfully:Two colonels had masterminded the revolt.

n. 
  1. a person who originates or is primarily responsible for the execution of a particular idea, project, or the like:the masterminds of company policy.
  • master + mind 1710–20

Collins Concise English Dictionary © HarperCollins Publishers::
mastermind /ˈmɑːstəˌmaɪnd/ vb
  1. (transitive) to plan and direct (a complex undertaking)
n
  1. a person of great intelligence or executive talent, esp one who directs an undertaking

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