/ Dictionary / Index U United States Army: Meaning and Definition of Find definitions for: Unit'ed States' Ar'my Pronunciation: [key] the permanent or regular military land force of the United States, under the authority of the Department of Defense since 1947. Abbr.: USA Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. United States Air Force Academy United States Customs Service Related Content Daily Word Quiz: prevalent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language