/ Dictionary / Index A American Civil Liberties Union: Meaning and Definition of Find definitions for: Amer'ican Civ'il Lib'erties Un"ion Pronunciation: [key] an organization founded in 1920 to defend the civil rights of all U.S. citizens. Abbr.: ACLU, A.C.L.U. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. American chestnut American Civil War Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language