Definition of "ignition" in English

noun

1. The act of igniting.

2. The initiation of combustion.

3. (automotive, mechanical engineering) A system for activating combustion in a combustion engine.

4. (automotive) Receptacle for a key used to start the engine in a vehicle.

   • Put the key in the ignition and turn in right.

5. (physics) The phenomenon of a thermonuclear fusion reaction becoming self-sustaining and no longer requiring external heating.