Main Entry: com·bus·tion

Pronunciation: \kəm-ˈbəs-chən\

Function: noun

Date: 15th century

1 : an act or instance of burning
2 : a usually rapid chemical process (as oxidation) that produces heat and usually light; also : a slower oxidation (as in the body)
3 : violent agitation : tumult

— com·bus·tive \-ˈbəs-tiv\ adjective