an army unit usually consisting of a headquarters and three or more companies
source: WordNet 3.0
a large indefinite number
A battalion of ants. A multitude of TV antennas. A plurality of religions.
source: WordNet 3.0
A body of troops; esp. a body of troops or an army in battle array.
source: Webster 1913
An infantry command of two or more companies, which is the tactical unit of the infantry, or the smallest command which is self- supporting upon the battlefield, and also the unit in which the strength of the infantry of an army is expressed.