/ Dictionary / Index U unary: Meaning and Definition of Find definitions for: u•na•ry Pronunciation: (y'nu-rē), [key] — adj. Math. pertaining to a function whose domain is a given set and whose range is contained in that set. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unary (Thesaurus) unarmed unary operation Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language