combustion (noun)
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. It is commonly referred to as burning and is the primary reaction that powers engines and produces fire.
"The internal combustion engine changed how people travel."
Think of a 'Bus' on fire. Com-BUS-tion. The BUS is the part that is burning (combusting).
Using 'combustion' to mean 'ignition'. → Ignition starts the fire; combustion is the fire burning.
Saying 'The car engine burns'. → The car has an internal combustion engine.
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