"isolated horizon" meaning in English

{
  "forms": [
    {
      "form": "isolated horizons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "isolated horizon (plural isolated horizons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Astrophysics",
          "orig": "en:Astrophysics",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "In the context of black holes, a null hypersurface (a surface where light rays travel) that is in equilibrium with its surrounding environment."
      ],
      "id": "en-isolated_horizon-en-noun-gK9o0Z2E",
      "links": [
        [
          "astrophysics",
          "astrophysics"
        ],
        [
          "context",
          "context"
        ],
        [
          "black hole",
          "black hole"
        ],
        [
          "null",
          "null"
        ],
        [
          "hypersurface",
          "hypersurface"
        ],
        [
          "equilibrium",
          "equilibrium"
        ],
        [
          "surrounding",
          "surrounding"
        ],
        [
          "environment",
          "environment"
        ]
      ],
      "raw_glosses": [
        "(astrophysics) In the context of black holes, a null hypersurface (a surface where light rays travel) that is in equilibrium with its surrounding environment."
      ],
      "topics": [
        "astrophysics"
      ]
    }
  ],
  "word": "isolated horizon"
}

{
  "forms": [
    {
      "form": "isolated horizons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "isolated horizon (plural isolated horizons)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Astrophysics"
      ],
      "glosses": [
        "In the context of black holes, a null hypersurface (a surface where light rays travel) that is in equilibrium with its surrounding environment."
      ],
      "links": [
        [
          "astrophysics",
          "astrophysics"
        ],
        [
          "context",
          "context"
        ],
        [
          "black hole",
          "black hole"
        ],
        [
          "null",
          "null"
        ],
        [
          "hypersurface",
          "hypersurface"
        ],
        [
          "equilibrium",
          "equilibrium"
        ],
        [
          "surrounding",
          "surrounding"
        ],
        [
          "environment",
          "environment"
        ]
      ],
      "raw_glosses": [
        "(astrophysics) In the context of black holes, a null hypersurface (a surface where light rays travel) that is in equilibrium with its surrounding environment."
      ],
      "topics": [
        "astrophysics"
      ]
    }
  ],
  "word": "isolated horizon"
}