ˈmæstɚˌmaɪnd 
British ˈmɑːstəˌmaɪnd
plural masterminds
: a person who plans and organizes something
He is considered (to be) the mastermind of the team's winning strategy.
a criminal mastermind
the mastermind behind the terrorist plot
masterminds; masterminded; masterminding
: to plan and organize (something) : to be the mastermind of (something)
They masterminded a unique solution to the problem.
He masterminded the bank robbery.
Cite this Entry
“Mastermind.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/mastermind. Accessed 18 Jun. 2026.
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