auto-ignition
/ˌɔːtəʊɪɡˈnɪʃn/noun
1Spontaneous ignition of a combustible mixture, without an external source of ignition (such as a flame or spark); specifically this event in an internal-combustion engine.
2Automated ignition; a mechanism that ignites a gas jet or burner automatically.
Origin
Early 20th century. From auto- + ignition.
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