"regular closed" meaning in All languages combined

{
  "etymology_text": "Apparently a backformation from regular closed set.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "regular closed (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The set {0,1,2} is closed, but is not regular closed, because its interior is Ø, so the closure of its interior is Ø."
        }
      ],
      "glosses": [
        "Being the closure of its interior."
      ],
      "id": "en-regular_closed-en-adj-WrWu5Zcl",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "closure",
          "closure"
        ],
        [
          "interior",
          "interior"
        ]
      ],
      "raw_glosses": [
        "(rare, mathematics, of a set) Being the closure of its interior."
      ],
      "raw_tags": [
        "of a set"
      ],
      "related": [
        {
          "word": "regular open"
        }
      ],
      "tags": [
        "not-comparable",
        "rare"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "regular closed"
}

{
  "etymology_text": "Apparently a backformation from regular closed set.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "regular closed (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "regular open"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with rare senses",
        "English uncomparable adjectives",
        "en:Mathematics"
      ],
      "examples": [
        {
          "text": "The set {0,1,2} is closed, but is not regular closed, because its interior is Ø, so the closure of its interior is Ø."
        }
      ],
      "glosses": [
        "Being the closure of its interior."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "closure",
          "closure"
        ],
        [
          "interior",
          "interior"
        ]
      ],
      "raw_glosses": [
        "(rare, mathematics, of a set) Being the closure of its interior."
      ],
      "raw_tags": [
        "of a set"
      ],
      "tags": [
        "not-comparable",
        "rare"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "regular closed"
}