"tract mansion" meaning in English

{
  "forms": [
    {
      "form": "tract mansions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tract mansion (plural tract mansions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2008, Paul L. Knox, Metroburbia, USA, page 163",
          "text": "Its homes are tract mansions and starter castles of 4,000 square feet and upward, featuring two-story entrance halls, great rooms, three- or four-car garages, huge kitchens, spa-sized bathrooms, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A very large and luxurious tract house."
      ],
      "id": "en-tract_mansion-en-noun-24s9P4tR",
      "links": [
        [
          "tract house",
          "tract house"
        ]
      ],
      "raw_glosses": [
        "(US) A very large and luxurious tract house."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "tract mansion"
}

{
  "forms": [
    {
      "form": "tract mansions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tract mansion (plural tract mansions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2008, Paul L. Knox, Metroburbia, USA, page 163",
          "text": "Its homes are tract mansions and starter castles of 4,000 square feet and upward, featuring two-story entrance halls, great rooms, three- or four-car garages, huge kitchens, spa-sized bathrooms, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A very large and luxurious tract house."
      ],
      "links": [
        [
          "tract house",
          "tract house"
        ]
      ],
      "raw_glosses": [
        "(US) A very large and luxurious tract house."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "tract mansion"
}