Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The performance rating of a diesel fuel, corresponding to the percentage of cetane in a cetane-methylnaphthalene mixture with the same ignition performance. A higher cetane number indicates greater fuel efficiency. Also called cetane rating.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A performance rating of diesel fuel corresponding to the percentage of cetane in a mixture with isocetane (or, formerly, methylnaphthalene) that would have the same performance.

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