/ Dictionary / Index M mastermind: Meaning and Definition of Find definitions for: mas•ter•mind Pronunciation: (mas'tur-mīnd", mä'stur-), [key] — v.t. to plan and direct (a usually complex project or activity), esp. skillfully: Two colonels had masterminded the revolt. —n. a person who originates or is primarily responsible for the execution of a particular idea, project, or the like: the masterminds of company policy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mastermind (Thesaurus) master mechanic Master of Arts Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language