Topic: MILITARY
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com‧mand1 W2

1 the control of a group of people or a situation
control
[uncountable] take command (of something) (=begin controlling a group or situation and making decisions)
The fire officer took command, ordering everyone to leave the building.
The fire officer took command, ordering everyone to leave the building.3TD an instruction to a computer to do something
computer
[countable]TD4 knowledge of something, especially a language, or ability to use something
command of something
(have a) good/excellent/poor etc command of something
He's studied in the US and has a good command of English.
He's studied in the US and has a good command of English.5
military
[C also + plural verb British English]a) PMA a part of an army, navy etc that is controlled separately and has a particular job :
pilots of the Southern Air Command
pilots of the Southern Air Commandb) PM a group of officers or officials who give orders :
the Army High Command
the Army High Commandc) PM the group of soldiers that an officer is in control of
6 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
at your command
a pianist with the keys at his command7 to be able to control your emotions and thoughts :
Kathleen walked in, tall, slim, confident and in total command of herself.
be in command of yourself
Kathleen walked in, tall, slim, confident and in total command of herself.