/ Dictionary / Index S supremacy: Meaning and Definition of Find definitions for: su•prem•a•cy Pronunciation: (su-prem'u-sē, soo-), [key] — n. the state of being supreme. supreme authority or power. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supremacy (Thesaurus) supremacist suprematism 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