com·bus·tion 
/kəmˈbʌstʃən/ noun
/kəmˈbʌstʃən/ noun [noncount] technical 1 : the act of burning
▪ Combustion may occur at high temperatures. — see also spontaneous combustion 2 technical : a chemical reaction that occurs when oxygen combines with other substances to produce heat and usually light
▪ This ratio of air to fuel results in better combustion. — see also internal combustion engine
▪ Combustion may occur at high temperatures. — see also spontaneous combustion
▪ This ratio of air to fuel results in better combustion. — see also internal combustion engine
