- The process of burning. (noun)
- A chemical change, especially oxidation, accompanied by the production of heat and light. (noun)
- Violent anger or agitation: Combustion within the populace slowly built up to the point of revolution. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.