1 octane number | Definition of octane number
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octane number

noun

Definition of octane number

: a number that is used to measure the antiknock properties of a liquid motor fuel (such as gasoline) with a higher number indicating a smaller likelihood of knocking

— called also octane rating

— compare cetane number

First Known Use of octane number

1931, in the meaning defined above

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More from Merriam-Webster on octane number

Britannica.com: Encyclopedia article about octane number

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