Definitions from Wiktionary (Legion)

▸ adjective:  Numerous; vast; very great in number
▸ noun:  (military, Ancient Rome) The major unit or division of the Roman army, usually comprising 3000 to 6000 infantry soldiers and 100 to 200 cavalry troops.
▸ noun:  (military) A combined arms major military unit featuring cavalry, infantry, and artillery, including historical units such as the British Legion, and present-day units such as the Spanish Legion and the French Foreign Legion.
▸ noun:  (military) A large military or semi-military unit trained for combat; any military force; an army, regiment; an armed, organized and assembled militia.
▸ noun:  (often Legion or the Legion) A national organization or association of former servicemen, such as the American Legion.
▸ noun:  A large number of people; a multitude.
▸ noun:  (often plural) A great number.
▸ noun:  (dated, taxonomy) A group of orders inferior to a class; in scientific classification, a term occasionally used to express an assemblage of objects intermediate between an order and a class.
▸ verb:  (transitive) To form into legions.
▸ noun:  (US, military) Ellipsis of American Legion.

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