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com·bus·tion  (km-bschn)
1. The process of burning.
2. A chemical change, especially oxidation, accompanied by the production of heat and light.
3. Violent anger or agitation: Combustion within the populace slowly built up to the point of revolution.

[Middle English, from Late Latin combusti, combustin-, from Latin combustus, past participle of combrere, to burn up, blend of com-, intensive pref.; see com- and ambrere, to burn around (amb-, ambi-, ambi- + rere, to burn).]

com·bustive (-tv) adj.

combustion [kəmˈbʌstʃən]
1. the process of burning
2. (Chemistry) any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light
3. (Chemistry) a chemical process in which two compounds, such as sodium and chlorine, react together to produce heat and light
4. (Chemistry) a process in which a compound reacts slowly with oxygen to produce little heat and no light
[from Old French, from Latin combūrere to burn up, from com- (intensive) + ūrere to burn]
combustive  n & adj

combustion  (km-bschn)
1. The process of burning.
2. A chemical change, especially through the rapid combination of a substance with oxygen, producing heat and, usually, light. See also spontaneous combustion.

combustion  /kmbstn/  n. [U] the act or process of burning combustion

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