Command is defined as to give orders or exert authority over someone or something.(verb)
An example of command is a teacher assigning homework to students.
The definition of a command is an order or the authority to command.(noun)
See command in Webster's New World College Dictionary
Origin: ME commanden < OFr comander < VL *commandare < L com-, intens. + mandare, to commit, entrust: see mandate
See command in American Heritage Dictionary 4
verb com·mand·ed, com·mand·ing, com·mands verb, transitive
Origin: Middle English commaunden
Origin: , from Old French comander
Origin: , from Late Latin commandāre
Origin: : Latin com-, intensive pref.; see com-
Origin: + Latin mandāre, to entrust; see man-2 in Indo-European roots.
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