the control of a group of people or a situation
under somebody's command
troops under the command of General Roberts
in command (of something)
Lieutenant Peters was now in command.
He felt fully in command of the situation.
take command (of something) (=begin controlling a group or situation and making decisions)
The fire officer took command, ordering everyone to leave the building.
at somebody's command
Each congressman has a large staff at his command (=available to be used).
By 1944, Fletcher had command of a B-17 bomber and a 10 man crew.
an order that should be obeyed:
Shoot when I give the command.
an instruction to a computer to do something
knowledge of something, especially a language, or ability to use something
(have a) good/excellent/poor etc command of something
He's studied in the US and has a good command of English.
military[C also + plural verb British English]
a part of an army, navy etc that is controlled separately and has a particular job:
pilots of the Southern Air Command
a group of officers or officials who give orders:
the Army High Command
the group of soldiers that an officer is in control of
if you have a particular skill at your command, you are able to use that skill well and easily:
a pianist with the keys at his command
to be able to control your emotions and thoughts:
Kathleen walked in, tall, slim, confident and in total command of herself.