| Noun | 1. | ignition switch - switch that operates a solenoid that closes a circuit to operate the starter ignition system, ignition - the mechanism that ignites the fuel in an internal-combustion engine ignition lock, lock - a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key electric switch, electrical switch, switch - control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit |