/ Dictionary / Index S self-mastery: Meaning and Definition of Find definitions for: self-mas•ter•y Pronunciation: (self"mas'tu-rē, -mä'stu-, self'-), [key] — n. self-control. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. self-mailer self-mate Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language