octane number


Definition of octane number

  1. :  a number that is used to measure the antiknock properties of a liquid motor fuel (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


Learn More about octane number

Seen and Heard

What made you want to look up octane number? Please tell us where you read or heard it (including the quote, if possible).