/ Dictionary / Index A Army Air Forces: Meaning and Definition of Find definitions for: Ar'my Air' Forc"es Pronunciation: [key] — U.S. Army. U.S. Army. a unit comprising almost all aviation, with its personnel, equipment, etc.: it became part of the Air Force on July 26, 1947. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. army army ant Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language