"closed curve" meaning in English

{
  "forms": [
    {
      "form": "closed curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed curve (plural closed curves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Curves",
          "orig": "en:Curves",
          "parents": [
            "Shapes",
            "Geometry",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Topology",
          "orig": "en:Topology",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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        }
      ],
      "glosses": [
        "A map from the circle, S¹, to a topological space.^((McLarty, p. 4))"
      ],
      "id": "en-closed_curve-en-noun-FM7g3xw-",
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "map",
          "map"
        ],
        [
          "circle",
          "circle"
        ],
        [
          "topological space",
          "topological space"
        ]
      ],
      "raw_glosses": [
        "(topology) A map from the circle, S¹, to a topological space.^((McLarty, p. 4))"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "closed curve"
}

{
  "forms": [
    {
      "form": "closed curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed curve (plural closed curves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
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        "en:Curves",
        "en:Topology"
      ],
      "glosses": [
        "A map from the circle, S¹, to a topological space.^((McLarty, p. 4))"
      ],
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "map",
          "map"
        ],
        [
          "circle",
          "circle"
        ],
        [
          "topological space",
          "topological space"
        ]
      ],
      "raw_glosses": [
        "(topology) A map from the circle, S¹, to a topological space.^((McLarty, p. 4))"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "closed curve"
}