"Square Mile" meaning in English

{
  "etymology_text": "The City's land area is about 1.12 square miles and roughly square in shape.",
  "forms": [
    {
      "form": "the Square Mile",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1",
        "head": "Square Mile"
      },
      "expansion": "the Square Mile",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "London",
          "orig": "en:London",
          "parents": [
            "Greater London, England",
            "England",
            "United Kingdom",
            "British Isles",
            "Europe",
            "Islands",
            "Earth",
            "Eurasia",
            "Places",
            "Nature",
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nicknames",
          "orig": "en:Nicknames",
          "parents": [
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of City of London."
      ],
      "id": "en-Square_Mile-en-name-RbbhdGYB",
      "links": [
        [
          "City of London",
          "City of London#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Synonym of City of London."
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "City of London"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "Square Mile"
}

{
  "etymology_text": "The City's land area is about 1.12 square miles and roughly square in shape.",
  "forms": [
    {
      "form": "the Square Mile",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1",
        "head": "Square Mile"
      },
      "expansion": "the Square Mile",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English uncountable nouns",
        "en:London",
        "en:Nicknames"
      ],
      "glosses": [
        "Synonym of City of London."
      ],
      "links": [
        [
          "City of London",
          "City of London#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Synonym of City of London."
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "City of London"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "Square Mile"
}