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| oc·tane num·ber (plural oc·tane num·bers) or oc·tane rat·ing (plural oc·tane rat·ings) |
noun |
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| Definition: |
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measure of fuel quality: a number that measures the ability of a liquid motor fuel such as gasoline to prevent preignition or knocking. Fuels with higher numbers are less likely to cause knocking.
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