ignition - definition and synonyms

noun 

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/ɪɡˈnɪʃ(ə)n/
  1. 1
    [singular] the place where you put in the key to make a car’s engine start
    1. a.
      the part of a car’s engine that makes the fuel start to burn so that the car can start
  2. 2
    [uncountable] formal the process of making something start to burn