from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun a
measureof the antiknock propertiesof an automobile fuel; isooctanehaving 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.
- noun a measure of the antiknock properties of gasoline
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