/ Dictionary / Index A A.C.L.S.: Meaning and Definition of Find definitions for: A.C.L.S. Pronunciation: [key] American Council of Learned Societies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aclinic line ACLU Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language