Pronunciation: (lē'jun),[key] —n. 1. a division of the Roman army, usually comprising 3000 to 6000 soldiers.
2. a military or semimilitary unit.
3. the Legion. a. See American Legion. b. See foreign legion (def. 2).
4. any large group of armed men.
5. any great number of persons or things; multitude.
—adj. very great in number: The holy man's faithful followers were legion.