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> An engine produces power. Locomotion can be derived from power but isn't required to.

By this definition, is a fuel cell an engine?

https://www.energy.gov/eere/fuelcells/fuel-cells#:~:text=A%2....

Perhaps! But I think by the time you're asking these kinds of questions you're then also dealing with one of the many reasons definitions can become nuanced as technology moves on.

Or even just a barrel of fuel that's lit on fire to produce thermal energy

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