command

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To direct with authority; give orders to.
• intransitive verb To have control or authority over; rule.
• intransitive verb To have at one's disposal.
• intransitive verb To deserve and receive as due; exact.
• intransitive verb To exercise dominating, authoritative influence over.
• intransitive verb To dominate by physical position; overlook.
• intransitive verb To give orders.
• intransitive verb To exercise authority or control as or as if one is a commander.
• noun The act of commanding.
• noun An order given with authority.
• noun Computers A signal that initiates an operation defined by an instruction.
• noun The authority to command.
• noun Possession and exercise of the authority to command.
• noun Ability to control or use; mastery.
• noun Dominance by location; extent of view.
• noun The jurisdiction of a commander.
• noun A military unit, post, district, or region under the control of one officer.
• noun A unit of the US Air Force that is larger than an air force.
• adjective Of, relating to, or constituting a command.
• adjective Done or performed in response to a command.

from The Century Dictionary.

• noun In whist and bridge, the best card of a suit, usually of one which the adversaries are trying to establish.
• To order or direct with authority; give an order or orders to; require obedience of; lay injunction upon; order; charge: with a person as direct object.
• Specifically To have or to exercise supreme power or authority, especially military or naval authority, over; have under direction or control; determine the actions, use, or course of: as, to command an army or a ship.
• To require with authority; demand; order; enjoin: with a thing as direct object: as, he commanded silence.
• To have within the range of one's (its) power or within the sphere of influence; dominate through ability, resources, position, etc., often specifically through military power or position; hence, have within the range of the eye; overlook.
• To bestow by exercise of controlling power.
• To exact, compel, or secure by moral influence; challenge; claim: as, a good magistrate commands the respect and affections of the people.
• To have at one's disposal and service.
• To intrust; commit; commend. See commend.
• Synonyms To bid, govern, rule, control. See enjoin.
• To act as or have the authority of a commander.
• To exercise influence or power.
• To be in a superior or commanding position.
• noun The right or authority to order, control, or dispose of; the right to be obeyed or to compel obedience: as, to have command of an army.
• noun Possession of controlling authority, force, or capacity; power of control, direction, or disposal; mastery: as, he had command of the situation; England has long held command of the sea; a good command of language.
• noun A position of chief authority; a position involving the right or power to order or control: as, General Smith was placed in command.
• noun The act of commanding; exercise of authority or influence.
• noun The thing commanded or ordered; a commandment; a mandate; an order; word of command.
• noun A body of troops, or any naval or military force, under the control of a particular officer.
• noun Dominating situation; range of control or oversight; hence, extent of view or outlook.
• noun In fortification, the height of the top of a parapet above the plane of its site, or above another work.
• noun Synonyms and Sway, rule, authority.
• noun Injunction, charge, direction, behest, bidding, requisition.

from the GNU version of the Collaborative International Dictionary of English.

• noun An authoritative order requiring obedience; a mandate; an injunction.
• noun The possession or exercise of authority.
• noun Authority; power or right of control; leadership.
• noun Power to dominate, command, or overlook by means of position; scope of vision; survey.