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Definition of Internal combustion engine
1. Noun. A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel. ¹
2. Noun. A heat engine in which intermittent or the continuous burning of a fuel takes place inside a combustion chamber; the resulting pressurized gas acts directly on the engine to do useful work, such as a piston engine, gas turbine, jet engine or rocket.[ ¹
¹ Source: wiktionary.com