"subbasement" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "basement"
      },
      "expansion": "sub- + basement",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + basement.",
  "forms": [
    {
      "form": "subbasements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "subbasement (plural subbasements)",
      "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": "English terms prefixed with sub-",
          "parents": [],
          "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": "Architecture",
          "orig": "en:Architecture",
          "parents": [
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2007 February 8, David W. Dunlap, “What May Have Made Good Neighbors Now Present a Puzzle”, in New York Times:",
          "text": "Joan H. Geismar is trying to unravel the mystery of old stone walls in the subbasement of Federal Hall National Memorial on Wall Street.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A basement located beneath another basement"
      ],
      "id": "en-subbasement-en-noun-L~OZ2it5",
      "links": [
        [
          "basement",
          "basement"
        ]
      ],
      "synonyms": [
        {
          "word": "sub-basement"
        }
      ]
    }
  ],
  "word": "subbasement"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "basement"
      },
      "expansion": "sub- + basement",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + basement.",
  "forms": [
    {
      "form": "subbasements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "subbasement (plural subbasements)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with sub-",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Architecture"
      ],
      "examples": [
        {
          "ref": "2007 February 8, David W. Dunlap, “What May Have Made Good Neighbors Now Present a Puzzle”, in New York Times:",
          "text": "Joan H. Geismar is trying to unravel the mystery of old stone walls in the subbasement of Federal Hall National Memorial on Wall Street.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A basement located beneath another basement"
      ],
      "links": [
        [
          "basement",
          "basement"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "sub-basement"
    }
  ],
  "word": "subbasement"
}