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English definition of “fuel”

fuel

noun     /fjʊəl/
B1 [C or U] a substance that is used to provide heat or power, usually by being burned: Wood, coal, oil, petrol and gas are all different kinds of fuel. Plutonium is a fuel used to produce nuclear energy. nuclear fuel unleaded fuel The new exhaust system, it is claimed, will lower fuel consumption.FuelsPetroleum products especially when used as fuel [U] anything that keeps people's ideas or feelings active, or makes them stronger: Reports in today's newspapers have added fuel to the controversy (= made it worse).Causing things to happen
(Definition of fuel noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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