Bat‐tal″ion (–tăl″yŭn; 106), n. [F. bataillon, fr. It. battaglione. See Battalia.] 1. A body of troops; esp. a body of troops or an army in battle array. “The whole battalion views.” Milton.
2. (Mil.) A regiment, or two or more companies of a regiment, esp. when assembled for drill or battle.