ign

Noun

ignition (countable and uncountable, plural ignitions)

1. The act of igniting.

   Synonyms:

   inflammation

2. The initiation of combustion.
3. A system for activating combustion in a combustion engine.
4. Receptacle for a key used to start the engine in a vehicle.
   • Put the key in the ignition and turn in right.
5. The phenomenon of a thermonuclear fusion reaction becoming self-sustaining and no longer requiring external heating.