"closed city" meaning in English

{
  "forms": [
    {
      "form": "closed cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed city (plural closed cities)",
      "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": "Russian terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "Russia",
          "orig": "en:Russia",
          "parents": [
            "Asia",
            "Europe",
            "Earth",
            "Eurasia",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2017 January 3, Douglas Preston, The Lost City of the Monkey God: A True Story, Grand Central Publishing",
          "text": "[A] man with a gravelly, slow-talking, New Mexico drawl, Glassmire had built a career as a respected scientist who had worked as an engineer for Los Alamos National Laboratory in the mid-fifties, when Los Alamos was still a closed city.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Any of several settlements, especially in Russia, that have travel and residency restrictions, typically because they house sensitive nuclear or defense facilities."
      ],
      "id": "en-closed_city-en-noun-JTWbblsU",
      "links": [
        [
          "settlement",
          "settlement"
        ],
        [
          "Russia",
          "Russia"
        ],
        [
          "travel",
          "travel"
        ],
        [
          "residency",
          "residency"
        ],
        [
          "restriction",
          "restriction"
        ],
        [
          "sensitive",
          "sensitive"
        ],
        [
          "nuclear",
          "nuclear"
        ],
        [
          "defense",
          "defense"
        ]
      ],
      "translations": [
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "zakrytyj gorod",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "закрытый город"
        }
      ],
      "wikipedia": [
        "closed city"
      ]
    }
  ],
  "word": "closed city"
}

{
  "forms": [
    {
      "form": "closed cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed city (plural closed cities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Russian terms with redundant script codes",
        "Translation table header lacks gloss",
        "en:Russia"
      ],
      "examples": [
        {
          "ref": "2017 January 3, Douglas Preston, The Lost City of the Monkey God: A True Story, Grand Central Publishing",
          "text": "[A] man with a gravelly, slow-talking, New Mexico drawl, Glassmire had built a career as a respected scientist who had worked as an engineer for Los Alamos National Laboratory in the mid-fifties, when Los Alamos was still a closed city.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Any of several settlements, especially in Russia, that have travel and residency restrictions, typically because they house sensitive nuclear or defense facilities."
      ],
      "links": [
        [
          "settlement",
          "settlement"
        ],
        [
          "Russia",
          "Russia"
        ],
        [
          "travel",
          "travel"
        ],
        [
          "residency",
          "residency"
        ],
        [
          "restriction",
          "restriction"
        ],
        [
          "sensitive",
          "sensitive"
        ],
        [
          "nuclear",
          "nuclear"
        ],
        [
          "defense",
          "defense"
        ]
      ],
      "wikipedia": [
        "closed city"
      ]
    }
  ],
  "translations": [
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "zakrytyj gorod",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "закрытый город"
    }
  ],
  "word": "closed city"
}