Command

1. An authoritative order requiring obedience; a mandate; an injunction.
2. The possession or exercise of authority.
3. Authority; power or right of control; leadership; as, the forces under his command.
4. Power to dominate, command, or overlook by means of position; scope of vision; survey.
5. Control; power over something; sway; influence; as, to have command over one's temper or voice; the fort has command of the bridge.
6. A body of troops, or any naval or military force or post, or the whole territory under the authority or control of a particular officer.
Word of command (Mil.),
a word or phrase of definite and established meaning, used in directing the movements of soldiers; as, aim; fire; shoulder arms, etc.