English definition of “command”
CONTROL [U] › control over someone or something and responsibility for them: The soldiers were under the command of a tough sergeant-major. Jones was in command (= the leader).
ORDER [C] › an order to do something
KNOWLEDGE [no plural] › knowledge of a subject, especially a language: She had a good command of French.
be at sb's command › to be ready to obey someone's orders
COMPUTER [C] › an instruction to a computer