ordered by a sovereign, as if by a sovereign, or by the exigencies of a situation: a command performance.
Origin: 1250–1300; (v.) Middle Englishcoma(u)nden < Anglo-Frenchcom(m)a(u)nder,Old Frenchcomander < Medieval Latincommandāre, equivalent to Latincom-com- + mandāre to entrust, order (cf. commend); (noun) late Middle Englishcomma(u)nde < Anglo-French,Old French, noun derivative of the v.
c.1300, from O.Fr. comander "to order, enjoin," from V.L. *commandare, from L. commendare "to recommend" (see commend), alt. by influence of L. mandare "to commit, entrust" (see mandate). Replaced O.E. bebeodan. The noun is attested from 1550s. Commander in chief attested from 1650s.
operating system A character string which tells a program to perform a specific action. Most commands take arguments which either modify the action performed or supply it with input. Commands may be typed by the user or read from a file by a command interpreter. It is also common to refer to menu items as commands. (1997-06-21)