2.[countableC usually singular] the place in a car where you put in a key to start the engine 〔汽车的〕点火开关 →5see picture at 见图car
3.[uncountableU] formalBURN the act of starting to burn or of making something start to burn 着火,起火燃烧;点火
Examples from the Corpus
ignition• No ignitionsource has been determined in the crash of the Boeing 747, which killed all 230 people aboard last July.• The most likely source of ignitionlay under Grissom's couch where bundles of wires ran across the floor of the capsule.• It sits atop the ignitionswitches for the rocketthrusters.• Phil left his key in the ignition again.• The key had been left in the ignition.• It caught on the secondtry, and after a minute's revving he switched off the ignition and let it die.• I turned the ignition key and nothing happened.• The unnamed man, 34, had just turned the ignition of the Mercedes when it exploded.