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Wiktionary

octane number

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

WordNet

octane number

n. a measure of the antiknock properties of gasoline [syn: octane rating]