"mess room" meaning in English

{
  "forms": [
    {
      "form": "mess rooms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mess room (plural mess rooms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "messroom"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1964 September, “News: Resignalling at Thirsk”, in Modern Railways, page 205",
          "text": "The existing mess room and workshop at Thirsk box will be converted into the new relay room and [...] the old relay room will be [...] converted into a mess room and workshop.",
          "type": "quotation"
        },
        {
          "ref": "2021 September 22, “National Rail Awards 2021: Exeter Train Care Depot”, in RAIL, number 940, page 51",
          "text": "Additionally, there are new offices and mess rooms, stabling sidings, and a new carriage washing plant.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of messroom"
      ],
      "id": "en-mess_room-en-noun-B5Ks9wih",
      "links": [
        [
          "messroom",
          "messroom#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "mess room"
}

{
  "forms": [
    {
      "form": "mess rooms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mess room (plural mess rooms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "messroom"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1964 September, “News: Resignalling at Thirsk”, in Modern Railways, page 205",
          "text": "The existing mess room and workshop at Thirsk box will be converted into the new relay room and [...] the old relay room will be [...] converted into a mess room and workshop.",
          "type": "quotation"
        },
        {
          "ref": "2021 September 22, “National Rail Awards 2021: Exeter Train Care Depot”, in RAIL, number 940, page 51",
          "text": "Additionally, there are new offices and mess rooms, stabling sidings, and a new carriage washing plant.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of messroom"
      ],
      "links": [
        [
          "messroom",
          "messroom#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "mess room"
}