1580s, from Middle French bataillon (16c.), from Italian battaglione "battle squadron," from diminutive of Vulgar Latin battalia "battle," from Latin bauttere "to beat" ( [..]

n. A body of infantry composed of two or more companies, forming a part of a regiment.

a military unit composed of a headquarters and two or more companies, batteries, or similar units

A military unit made up of 500-1500 men. It is formed out of smaller units called companies.

An army unit usually consisting of a headquarters and three or more companies.

Basic combat unit of the army. A Canadian infantry battalion included four rifle companies and a support company, which was equipped with heavier weapons; the total strength was approximately 850 personnel. Canadian War Museum

A military unit larger than a company and smaller than a regiment.

A unit of about 700-900 Marines comprised of several companies or batteries and a headquarters company or battery. In infantry, artillery, engineer, Raider, and parachute regiments, battalions were de [..]

A body of foot soldiers, subdivided into companies ( but sometimes identical with 'regiment'). Also a designation indicating a soldier belongs to the main body of soldiers (hatt companies) r [..]

a military unit made up of at least two company – or battery

(n) an army unit usually consisting of a headquarters and three or more companies(n) a large indefinite number

(military) An army unit having two or more companies, etc. and a headquarters. Traditionally forming part of a regiment. (US,military) an army unit having two or more companies, etc. and a headqua [..]