Noun | 1. | ![]() commutator - switch for reversing the direction of an electric current controller, control - a mechanism that controls the operation of a machine; "the speed controller on his turntable was not working properly"; "I turned the controls over to her" cutout - a switch that interrupts an electric circuit in the event of an overload ignition switch - switch that operates a solenoid that closes a circuit to operate the starter push button, button, push - an electrical switch operated by pressing; "the elevator was operated by push buttons"; "the push beside the bed operated a buzzer at the desk" selector switch, selector - a switch that is used to select among alternatives three-point switch, three-way switch - an electric switch that has three terminals; used to control a circuit from two different locations time-switch - a switch set to operate at a desired time on/off switch, on-off switch, toggle switch, toggle - a hinged switch that can assume either of two positions |