"open city" meaning in English

{
  "forms": [
    {
      "form": "open cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "open city (plural open 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": "topical",
          "langcode": "en",
          "name": "International law",
          "orig": "en:International law",
          "parents": [
            "Law",
            "Justice",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military",
          "orig": "en:Military",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A city which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture."
      ],
      "id": "en-open_city-en-noun-sTsQWkqM",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "international law",
          "international law"
        ]
      ],
      "qualifier": "international law",
      "raw_glosses": [
        "(military, international law) A city which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture."
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "city which has abandoned defensive efforts",
          "tags": [
            "feminine"
          ],
          "word": "ville ouverte"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "city which has abandoned defensive efforts",
          "tags": [
            "feminine"
          ],
          "word": "offene Stadt"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "city which has abandoned defensive efforts",
          "word": "nyílt város"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "city which has abandoned defensive efforts",
          "tags": [
            "feminine"
          ],
          "word": "città aperta"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "city which has abandoned defensive efforts",
          "tags": [
            "feminine"
          ],
          "word": "cidade aberta"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "city which has abandoned defensive efforts",
          "tags": [
            "feminine"
          ],
          "word": "ciudad abierta"
        }
      ]
    }
  ],
  "word": "open city"
}

{
  "forms": [
    {
      "form": "open cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "open city (plural open 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",
        "en:International law",
        "en:Military"
      ],
      "glosses": [
        "A city which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "international law",
          "international law"
        ]
      ],
      "qualifier": "international law",
      "raw_glosses": [
        "(military, international law) A city which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture."
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "city which has abandoned defensive efforts",
      "tags": [
        "feminine"
      ],
      "word": "ville ouverte"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "city which has abandoned defensive efforts",
      "tags": [
        "feminine"
      ],
      "word": "offene Stadt"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "city which has abandoned defensive efforts",
      "word": "nyílt város"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "city which has abandoned defensive efforts",
      "tags": [
        "feminine"
      ],
      "word": "città aperta"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "city which has abandoned defensive efforts",
      "tags": [
        "feminine"
      ],
      "word": "cidade aberta"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "city which has abandoned defensive efforts",
      "tags": [
        "feminine"
      ],
      "word": "ciudad abierta"
    }
  ],
  "word": "open city"
}