IPA: /kəmˈbʌs.tʃən/
KK: /kəmˈbʌs.tʃən/
A process in which a substance reacts with oxygen to produce heat and light, often resulting in fire.
The combustion of gasoline in an engine produces energy to power the vehicle.
Combustion is formed from "com-" (meaning together) and "bustion" (from Latin "urere", meaning to burn). The word describes the process of burning together, typically involving a chemical reaction that produces heat and light.
Think of things 'burning together' — 'com-' means together, and 'bustion' relates to burning.