"perfect set" meaning in English

{
  "forms": [
    {
      "form": "perfect sets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "perfect set (plural perfect sets)",
      "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": "Mathematical analysis",
          "orig": "en:Mathematical analysis",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The Cantor set is perfect."
        }
      ],
      "glosses": [
        "A set which is equal to its set of limit points. That is, a set A is perfect if A'=A."
      ],
      "id": "en-perfect_set-en-noun-xqh33nYt",
      "links": [
        [
          "mathematical analysis",
          "mathematical analysis"
        ]
      ],
      "raw_glosses": [
        "(mathematical analysis) A set which is equal to its set of limit points. That is, a set A is perfect if A'=A."
      ],
      "topics": [
        "mathematical-analysis",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "perfect set"
}

{
  "forms": [
    {
      "form": "perfect sets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "perfect set (plural perfect sets)",
      "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:Mathematical analysis"
      ],
      "examples": [
        {
          "text": "The Cantor set is perfect."
        }
      ],
      "glosses": [
        "A set which is equal to its set of limit points. That is, a set A is perfect if A'=A."
      ],
      "links": [
        [
          "mathematical analysis",
          "mathematical analysis"
        ]
      ],
      "raw_glosses": [
        "(mathematical analysis) A set which is equal to its set of limit points. That is, a set A is perfect if A'=A."
      ],
      "topics": [
        "mathematical-analysis",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "perfect set"
}