What is the meaning of Army?

A large, highly organized military force, concerned mainly with ground (rather than air or naval) operations.

Used absolutely for that entire branch of the armed forces.

Within a vast military, a very large tactical contingent (e.g. a number of divisions).

The governmental agency in charge of a state's army.

A large group of people working toward the same purpose.

A large group of social animals working toward the same purpose.

Any multitude.

The military as a whole.

Source: wiktionary.org