"cetane number" meaning in English

{
  "forms": [
    {
      "form": "cetane numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cetane number (plural cetane numbers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Persian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Petroleum",
          "orig": "en:Petroleum",
          "parents": [
            "Fossil fuels",
            "Liquids",
            "Carbon",
            "Energy",
            "Natural resources",
            "Matter",
            "Carbon group elements",
            "Nature",
            "Chemistry",
            "Chemical elements",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "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."
      ],
      "id": "en-cetane_number-en-noun-r5kstBe-",
      "links": [
        [
          "performance",
          "performance"
        ],
        [
          "rating",
          "rating"
        ],
        [
          "diesel",
          "diesel"
        ],
        [
          "fuel",
          "fuel"
        ],
        [
          "percentage",
          "percentage"
        ],
        [
          "isocetane",
          "isocetane"
        ],
        [
          "methylnaphthalene",
          "methylnaphthalene"
        ]
      ],
      "related": [
        {
          "word": "octane number"
        }
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "performance rating of diesel fuel",
          "tags": [
            "masculine"
          ],
          "word": "indice de cétane"
        },
        {
          "code": "fa",
          "lang": "Persian",
          "roman": "'adad-e setân",
          "sense": "performance rating of diesel fuel",
          "word": "عدد ستان"
        }
      ]
    }
  ],
  "word": "cetane number"
}

{
  "forms": [
    {
      "form": "cetane numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cetane number (plural cetane numbers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "octane number"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with French translations",
        "Terms with Persian translations",
        "en:Petroleum"
      ],
      "glosses": [
        "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."
      ],
      "links": [
        [
          "performance",
          "performance"
        ],
        [
          "rating",
          "rating"
        ],
        [
          "diesel",
          "diesel"
        ],
        [
          "fuel",
          "fuel"
        ],
        [
          "percentage",
          "percentage"
        ],
        [
          "isocetane",
          "isocetane"
        ],
        [
          "methylnaphthalene",
          "methylnaphthalene"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "performance rating of diesel fuel",
      "tags": [
        "masculine"
      ],
      "word": "indice de cétane"
    },
    {
      "code": "fa",
      "lang": "Persian",
      "roman": "'adad-e setân",
      "sense": "performance rating of diesel fuel",
      "word": "عدد ستان"
    }
  ],
  "word": "cetane number"
}