command
/kə-ˈmand/
verb
to direct authoritatively : order
to exercise a dominating influence over : have command of: such as
to have at one's immediate disposal
commanded adherence to the rules
noun
an order given
a signal that actuates a device (such as a control mechanism in a spacecraft or one step in a computer)
the activation of a device by means of such a signal
The command was to hold fire.
adjective
done on command or request
a command performance