combustion
noun
com·bus·tion
kəm-ˈbəs-chən
1
: an act or instance of burning
Smoke is produced during combustion.
2
: a usually rapid chemical process (such as oxidation) that produces heat and usually light
The carburetor mixes fuel with air for combustion.
also
: a slower oxidation (as in the body)
3
: violent agitation : tumult
… periods of great social combustion alternating with quiescence …—Kurt Andersen
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Merriam-Webster unabridged
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