/ Dictionary / Index U USA: Meaning and Definition of Find definitions for: USA Pronunciation: [key] United States of America. United States Army. USA Network (a cable television channel). U.S.A. Pronunciation: [key] Union of South Africa. United States of America. United States Army. U.S.A. Pronunciation: [key] a trilogy of novels (1939) by John Dos Passos, consisting of The 42nd Parallel, 1919, and The Big Money. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: usa (Thesaurus) us usable Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language