/ Dictionary / Index M masterful: Meaning and Definition of Find definitions for: mas•ter•ful Pronunciation: (mas'tur-ful, mä'stur-), [key] — adj. dominating; self-willed; imperious. having or showing the qualities of a master; authoritative; powerful. showing mastery or skill; masterly: a masterful performance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: masterful (Thesaurus) master file master hand Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language