Dictionary  oc'tane num"ber(of gasoline) a designation of antiknock quality, 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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