/ Dictionary / Index L legionnaire: Meaning and Definition of Find definitions for: le•gion•naire Pronunciation: (lē"ju-nâr'), [key] — n. (often cap.) a member of the American Legion. a member of any legion; legionary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: legionnaire (Thesaurus) Legionella* legionnaires' disease Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language