"fixed field" meaning in English

{
  "forms": [
    {
      "form": "fixed fields",
      "tags": [
        "plural"
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      "expansion": "fixed field (plural fixed fields)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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            "Entries with incorrect language header",
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          "kind": "topical",
          "langcode": "en",
          "name": "Algebra",
          "orig": "en:Algebra",
          "parents": [
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            "Formal sciences",
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      ],
      "glosses": [
        "A subfield of a given field which contains all of the fixed points that are common to all of the automorphisms of some subgroup of the automorphism group of that given field."
      ],
      "id": "en-fixed_field-en-noun-z5TxtXl8",
      "links": [
        [
          "algebra",
          "algebra"
        ],
        [
          "subfield",
          "subfield"
        ],
        [
          "fixed point",
          "fixed point"
        ],
        [
          "automorphism group",
          "automorphism group"
        ]
      ],
      "qualifier": "Galois theory",
      "raw_glosses": [
        "(algebra, Galois theory) A subfield of a given field which contains all of the fixed points that are common to all of the automorphisms of some subgroup of the automorphism group of that given field."
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "fixed field"
}

{
  "forms": [
    {
      "form": "fixed fields",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fixed field (plural fixed fields)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
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        "en:Algebra"
      ],
      "glosses": [
        "A subfield of a given field which contains all of the fixed points that are common to all of the automorphisms of some subgroup of the automorphism group of that given field."
      ],
      "links": [
        [
          "algebra",
          "algebra"
        ],
        [
          "subfield",
          "subfield"
        ],
        [
          "fixed point",
          "fixed point"
        ],
        [
          "automorphism group",
          "automorphism group"
        ]
      ],
      "qualifier": "Galois theory",
      "raw_glosses": [
        "(algebra, Galois theory) A subfield of a given field which contains all of the fixed points that are common to all of the automorphisms of some subgroup of the automorphism group of that given field."
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "fixed field"
}