/ Dictionary / Index A Allier: Meaning and Definition of Find definitions for: Al•lier Pronunciation: (a-lyā'), [key] — n. a river flowing N from S France to the Loire. ab. 250 mi. (400 km) long. a department in central France. 378,406; 2850 sq. mi. (7380 sq. km). Cap.: Moulins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. allied allies Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language