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English definition of “fuel”

fuel

noun uk   /fjʊəl/ us  
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. [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).

fuel

verb [T] uk   /fjʊəl/ (-ll- or US usually -l-) us  
to supply a system with a substance that can be burned to provide heat or power: Our heating is fuelled by gas. We have a gas-fuelled heating system. petrol/hydrogen-fuelled cars Something that fuels a feeling or a type of behaviour increases it or makes it stronger: The rapid promotion of the director's son has itself fuelled resentment within the company. The prime minister's speech fuelled speculation that she is about to resign.
(Definition of fuel from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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