"invalid chair" meaning in English

{
  "forms": [
    {
      "form": "invalid chairs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "invalid chair (plural invalid chairs)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chairs",
          "orig": "en:Chairs",
          "parents": [
            "Furniture",
            "Sitting",
            "Home",
            "Body",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Disability",
          "orig": "en:Disability",
          "parents": [
            "Health",
            "Society",
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Mobility aids",
          "orig": "en:Mobility aids",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An early wheelchair."
      ],
      "id": "en-invalid_chair-en-noun-N~QJM6P0",
      "links": [
        [
          "wheelchair",
          "wheelchair"
        ]
      ],
      "raw_glosses": [
        "(dated) An early wheelchair."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "invalid chair"
}

{
  "forms": [
    {
      "form": "invalid chairs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "invalid chair (plural invalid chairs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English dated terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Chairs",
        "en:Disability",
        "en:Mobility aids"
      ],
      "glosses": [
        "An early wheelchair."
      ],
      "links": [
        [
          "wheelchair",
          "wheelchair"
        ]
      ],
      "raw_glosses": [
        "(dated) An early wheelchair."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "invalid chair"
}