/ Dictionary / Index U USAFI: Meaning and Definition of Find definitions for: USAFI Pronunciation: [key] United States Armed Forces Institute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. U.S.A.F. U.S.A.F.R. 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