"BTU" meaning in English

{
  "forms": [
    {
      "form": "BTUs",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "BTU (plural BTUs)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "British thermal unit"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "name": "Pages with 1 entry",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Energy",
          "orig": "en:Energy",
          "parents": [
            "Nature",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Units of energy",
          "orig": "en:Units of energy",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "MMBtu"
        }
      ],
      "glosses": [
        "Initialism of British thermal unit."
      ],
      "id": "en-BTU-en-noun-Uz~Ev6O6",
      "links": [
        [
          "British thermal unit",
          "British thermal unit#English"
        ]
      ],
      "raw_glosses": [
        "(energy) Initialism of British thermal unit."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "business",
        "energy",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/biː.tiː.juː/"
    }
  ],
  "word": "BTU"
}

{
  "derived": [
    {
      "word": "MMBtu"
    }
  ],
  "forms": [
    {
      "form": "BTUs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "BTU (plural BTUs)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "British thermal unit"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English links with redundant wikilinks",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Energy",
        "en:Units of energy"
      ],
      "glosses": [
        "Initialism of British thermal unit."
      ],
      "links": [
        [
          "British thermal unit",
          "British thermal unit#English"
        ]
      ],
      "raw_glosses": [
        "(energy) Initialism of British thermal unit."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "business",
        "energy",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/biː.tiː.juː/"
    }
  ],
  "word": "BTU"
}