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- Dictionaryoctane number
noun
- 1. a figure indicating the anti-knock properties of a fuel, based on a comparison with a mixture of isooctane and heptane.
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- Octane rating
Standard measure of an engine or aviation fuel's ability to withstand compression without detonating
An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without undergoing pre-ignition. The higher the octane number, the more compression the fuel can withstand before detonating. Octane rating does not relate directly to the power output or the energy content of the fuel per unit mass or volume, but simply indicates... Wikipedia
