Meaning of legion

le•gion

1. a division of the Roman army, usually comprising 3000 to 6000 soldiers.
2. a military or semimilitary unit.
1. SeeAmerican Legion.
2. Seeforeign legion(def. 2).
4. any large group of armed men.
5. any great number of persons or things; multitude.

1. very great in number: The holy man's faithful followers were legion.