To direct with authority; give orders to. To have control or authority over; rule: a general who commands an army. To have at one's disposal: a person who commands seven languages. To deserve and receive as due; exact: The troops' bravery commanded respect. To exercise dominating, authoritative influence over: "He commands any room he enters\u201d ( Stephen Schiff). To dominate by physical position; overlook: a mountain commanding the valley below. To give orders. To exercise authority or control as or as if one is a commander. The act of commanding. An order given with authority. Computer Science A signal that initiates an operation defined by an instruction. The authority to command: an admiral in command. Possession and exercise of the authority to command: command of the seas. Ability to control or use; mastery: command of four languages. Dominance by location; extent of view. The jurisdiction of a commander. A military unit, post, district, or region under the control of one officer. A unit of the U.S. Air Force that is larger than an air force. Of, relating to, or constituting a command: command headquarters; a command decision. Done or performed in response to a command: a command performance.