ignition

Etymology

From French ignition.

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.

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