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combustion

combustion /kəmˈbʌstʃən/ noun
combustion
/kəmˈbʌstʃən/
noun
Britannica Dictionary definition of COMBUSTION
[noncount] technical
1 
: the act of burning
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— see also spontaneous combustion
2 
technical : a chemical reaction that occurs when oxygen combines with other substances to produce heat and usually light
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— see also internal combustion engine