octane number

== English == === Noun === octane number (plural octane numbers) A measure of the antiknock properties of an automobile fuel. Synonym: octane rating ==== Hyponyms ==== motor octane number (MON) research octane number (RON) anti-knock index (AKI) ==== Derived terms ==== motor octane number (MON) research octane number (RON) ==== Translations ==== === See also === cetane number === Further reading === octane rating on Wikipedia.Wikipedia