Within a vast military, a very large tactical contingent (e.g. a number of divisions).
Used absolutely for that entire branch of the armed forces.
The governmental agency in charge of a state's army.
A large, highly organized military force, concerned mainly with ground (rather than air or naval) operations.
The military as a whole.
Any multitude.
A large group of people working toward the same purpose.
A large group of social animals working toward the same purpose.
A unit of armed troops under the command of an officer, and consisting of several smaller units; now specifically, usually composed of two or more battalions.
To systematize, or put in rigid order.
To form soldiers into a regiment.