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ignition 
  n 
1 the act or process of initiating combustion 
2 the process of igniting the fuel in an internal-combustion engine 
3 usually preceded by: the the devices used to ignite the fuel in an internal-combustion engine 

compression-ignition engine 
  n a type of internal-combustion engine, such as a diesel, in which ignition occurs as a result of the rise in temperature caused by compression of the mixture in the cylinder 
electronic ignition 
  n any system that uses an electronic circuit to supply the voltage to the sparking plugs of an internal-combustion engine 
ignition coil 
  n an induction coil that supplies the high voltage to the sparking plugs of an internal-combustion engine 
ignition key 
  n the key used in a motor vehicle to turn the switch that connects the battery to the ignition system and other electrical devices 
pre-ignition 
  n ignition of all or part of the explosive charge in an internal-combustion engine before the exact instant necessary for correct operation 



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