Definition of octane noun from the Oxford Advanced Learner's Dictionary

 

octane

 noun
noun
BrE BrE//ˈɒkteɪn//
 
; NAmE NAmE//ˈɑːkteɪn//
 
 
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a chemical substance in petrol/gas, used as a way of measuring its quality high-octane fuel Word Origin late 19th cent.: from octo- ‘eight’ (denoting eight carbon atoms) + -ane.
See the Oxford Advanced American Dictionary entry: octane

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