"second-countable" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "second-countable (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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Topology",
          "orig": "en:Topology",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Such that its topology has a countable base, said of a topological space."
      ],
      "id": "en-second-countable-en-adj-3XIJVHEK",
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "countable",
          "countable"
        ],
        [
          "base",
          "base"
        ],
        [
          "topological space",
          "topological space"
        ]
      ],
      "raw_glosses": [
        "(topology) Such that its topology has a countable base, said of a topological space."
      ],
      "synonyms": [
        {
          "word": "second countable"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "second-countable"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "second-countable (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Topology"
      ],
      "glosses": [
        "Such that its topology has a countable base, said of a topological space."
      ],
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "countable",
          "countable"
        ],
        [
          "base",
          "base"
        ],
        [
          "topological space",
          "topological space"
        ]
      ],
      "raw_glosses": [
        "(topology) Such that its topology has a countable base, said of a topological space."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "second countable"
    }
  ],
  "word": "second-countable"
}