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combustion

com·bus·tion [ kəm búschən ]


noun 
Definition:
 
1. ignition: the burning of fuel in an engine to provide power

2. chemical reaction: a chemical process in which a substance reacts vigorously with oxygen to produce heat and light, seen as a flame

3. extreme agitation: a state of extreme discontent and agitation

[15th century. < Latin combustus, past participle of comburere "burn up" < urere "to burn"]

com·bus·tive adjective
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