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