"casualty department" meaning in English

{
  "forms": [
    {
      "form": "casualty departments",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "casualty department (plural casualty departments)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "(also casualty ward) the department of a hospital providing immediate treatment for emergency cases."
      ],
      "id": "en-casualty_department-en-noun-q5KpCwGq",
      "raw_glosses": [
        "(British) (also casualty ward) the department of a hospital providing immediate treatment for emergency cases."
      ],
      "synonyms": [
        {
          "word": "A&E"
        },
        {
          "word": "accident and emergency"
        },
        {
          "tags": [
            "North-America"
          ],
          "word": ";"
        },
        {
          "word": "emergency department"
        },
        {
          "word": "emergency room"
        },
        {
          "tags": [
            "clipping"
          ],
          "word": "casualty"
        }
      ],
      "tags": [
        "British"
      ]
    }
  ],
  "word": "casualty department"
}

{
  "forms": [
    {
      "form": "casualty departments",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "casualty department (plural casualty departments)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "(also casualty ward) the department of a hospital providing immediate treatment for emergency cases."
      ],
      "raw_glosses": [
        "(British) (also casualty ward) the department of a hospital providing immediate treatment for emergency cases."
      ],
      "synonyms": [
        {
          "word": "A&E"
        },
        {
          "word": "accident and emergency"
        },
        {
          "tags": [
            "North-America"
          ],
          "word": ";"
        },
        {
          "word": "emergency department"
        },
        {
          "word": "emergency room"
        }
      ],
      "tags": [
        "British"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "clipping"
      ],
      "word": "casualty"
    }
  ],
  "word": "casualty department"
}