/ Dictionary / Index A ATS: Meaning and Definition of Find definitions for: ATS Pronunciation: [key] Auxiliary Territorial Service (organized in 1941 for women serving in the British army; became part of army in 1949 as WRAC). A.T.S. Pronunciation: [key] American Temperance Society. American Tract Society. American Transport Service. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ats (Thesaurus) atry att. Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language