"開集" meaning in 漢語

{
  "categories": [
    {
      "kind": "other",
      "name": "Wikipedia with redundant first parameter",
      "orig": "wikipedia with redundant first parameter",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "待分類的漢語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "漢語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "漢語/數學用語",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "漢語",
  "lang_code": "zh",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "拓樸學上的一種集合，與閉集相對，度量空間裡的開球即其一例。"
      ],
      "id": "zh-開集-zh-noun-eDMopWHx"
    }
  ],
  "word": "開集"
}

{
  "categories": [
    "wikipedia with redundant first parameter",
    "待分類的漢語詞",
    "漢語",
    "漢語/數學用語"
  ],
  "lang": "漢語",
  "lang_code": "zh",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "拓樸學上的一種集合，與閉集相對，度量空間裡的開球即其一例。"
      ]
    }
  ],
  "word": "開集"
}