Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A numerical representation of the antiknock properties of motor fuel, compared with a standard reference fuel, such as isooctane, which has an octane number of 100. Also called octane rating.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a measure of the antiknock properties of an automobile fuel; isooctane having an octane number of 100, a fuel with the same antiknock properties as a mixture of 90% isooctane and 10% heptane having an octane number of 90

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a measure of the antiknock properties of gasoline

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