"semibituminous" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "semi",
        "3": "bituminous"
      },
      "expansion": "semi- + bituminous",
      "name": "prefix"
    }
  ],
  "etymology_text": "semi- + bituminous",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "semibituminous (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with semi-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Coal",
          "orig": "en:Coal",
          "parents": [
            "Fossil fuels",
            "Carbon",
            "Energy",
            "Natural resources",
            "Carbon group elements",
            "Nature",
            "Matter",
            "Chemical elements",
            "All topics",
            "Chemistry",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "semibituminous coal"
        }
      ],
      "glosses": [
        "Partly bituminous."
      ],
      "id": "en-semibituminous-en-adj-gwTWxeYb",
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "semibituminous"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "semi",
        "3": "bituminous"
      },
      "expansion": "semi- + bituminous",
      "name": "prefix"
    }
  ],
  "etymology_text": "semi- + bituminous",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "semibituminous (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English terms prefixed with semi-",
        "English uncomparable adjectives",
        "en:Coal"
      ],
      "examples": [
        {
          "text": "semibituminous coal"
        }
      ],
      "glosses": [
        "Partly bituminous."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "semibituminous"
}