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octane number
 

Definitions from WordNet

Noun octane number has 1 sense
  1. octane number, octane rating - a measure of the antiknock properties of gasoline
    --1 is a kind of measure, quantity, amount

Definitions from the Web

Octane Number

Noun: The octane number is a measure of a fuel's ability to resist knocking or pinging during combustion.

Example Sentence: The higher the octane number, the better the fuel will perform in high-compression engines.

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