/ Dictionary / Index U UNO: Meaning and Definition of Find definitions for: UNO Pronunciation: [key] United Nations Organization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unnumbered unobtrusive Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language