Noun
a measure of the antiknock properties of gasoline
Source: WordNetCNG-specific engines, however, use a higher compression ratio due to this fuel's higher octane number of 120–130. citation citation Besides use in road vehicles, it is also used in aerial vehicles. Source: Internet
One of the best known is the research octane number (RON). Source: Internet
The maximum road octane number requirements were 82 for a peripheral intake port wankel engine, and less than 70 for a side inlet port engine. Source: Internet
The degree of branching affects characteristics, such as the octane number or cetane number in petroleum chemistry. Source: Internet