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English definition of “octane number”

octane number

noun [C] uk   (also octane rating) us  
a number showing the quality of petrol by representing how well and with how much power it can make an engine workMechanical engineeringPetroleum products especially when used as fuelFuels
(Definition of octane number from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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