Definitions for octane number
Random House Webster's College Dictionary
a designation of antiknock quality of gasoline, numerically equal to the percentage of isooctane by volume in a mixture of isooctane and normal heptane that matches the given gasoline in antiknock characteristics. Also called oc′tane rat`ing.
Origin of octane number:
octane number, octane rating(noun)
a measure of the antiknock properties of gasoline
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
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