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English definition of “oil”

oil

noun [U] (FUEL)   /ɔɪl/
a thick, liquid substance that burns and is used as fuel or as a lubricant (= substance that helps connecting parts move easily), or the thick liquid taken from under the ground which oil, gasoline, and other products are made from: motor oil fuel/heating oil Change your car’s oil every 12,000 miles.
(Definition of oil noun (FUEL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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