ig ‧ ni ‧ tion /ɪɡˈnɪʃ ə n/ BrE AmE noun
1 . [singular] the electrical part of a vehicle’s engine that makes it start working
2 . [countable usually singular] the place in a car where you put in a key to start the engine
3 . [uncountable] formal the act of starting to burn or of making something start to burn