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Related to combustive: comburent
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 combustiō, combustiōn-, from Latin combustus, past participle of combūrere, to burn up, blend of com-, intensive pref.; see com- and ambūrere, to burn around (amb-, ambi-, ambi- + ūrere, to burn).]
com·bus′tive (-tĭv) adj.