Definitions from Wiktionary (ignition)

▸ noun:  The act of igniting.
▸ noun:  The initiation of combustion.
▸ noun:  (automotive, mechanical engineering) A system for activating combustion in a combustion engine.
▸ noun:  (automotive) Receptacle for a key used to start the engine in a vehicle.
▸ noun:  (physics) The phenomenon of a thermonuclear fusion reaction becoming self-sustaining and no longer requiring external heating.

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