"even function" meaning in English

{
  "forms": [
    {
      "form": "even functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "even function (plural even functions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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        {
          "kind": "other",
          "name": "Terms with Polish translations",
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          "name": "Terms with Russian translations",
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        },
        {
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Functions",
          "orig": "en:Functions",
          "parents": [
            "Algebra",
            "Calculus",
            "Geometry",
            "Mathematical analysis",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "odd function"
        }
      ],
      "glosses": [
        "Any function whose value is unchanged if the independent variable changes sign i.e. f(x) = f(-x)"
      ],
      "id": "en-even_function-en-noun-8I4H806j",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "value",
          "value"
        ],
        [
          "independent variable",
          "independent variable"
        ],
        [
          "sign",
          "sign"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Any function whose value is unchanged if the independent variable changes sign i.e. f(x) = f(-x)"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "da",
          "lang": "Danish",
          "sense": "unaffected by sign",
          "tags": [
            "common-gender"
          ],
          "word": "lige funktion"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "unaffected by sign",
          "tags": [
            "feminine"
          ],
          "word": "fonction paire"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "unaffected by sign",
          "tags": [
            "feminine"
          ],
          "word": "gerade Funktion"
        },
        {
          "code": "is",
          "lang": "Icelandic",
          "sense": "unaffected by sign",
          "tags": [
            "neuter"
          ],
          "word": "jafnstætt fall"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "unaffected by sign",
          "tags": [
            "feminine"
          ],
          "word": "funkcja parzysta"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "čótnaja fúnkcija",
          "sense": "unaffected by sign",
          "tags": [
            "feminine"
          ],
          "word": "чётная фу́нкция"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "unaffected by sign",
          "tags": [
            "common-gender"
          ],
          "word": "jämn funktion"
        }
      ]
    }
  ],
  "word": "even function"
}

{
  "coordinate_terms": [
    {
      "word": "odd function"
    }
  ],
  "forms": [
    {
      "form": "even functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "even function (plural even functions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
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        "Terms with French translations",
        "Terms with German translations",
        "Terms with Icelandic translations",
        "Terms with Polish translations",
        "Terms with Russian translations",
        "Terms with Swedish translations",
        "en:Functions",
        "en:Mathematics"
      ],
      "glosses": [
        "Any function whose value is unchanged if the independent variable changes sign i.e. f(x) = f(-x)"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "value",
          "value"
        ],
        [
          "independent variable",
          "independent variable"
        ],
        [
          "sign",
          "sign"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Any function whose value is unchanged if the independent variable changes sign i.e. f(x) = f(-x)"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "da",
      "lang": "Danish",
      "sense": "unaffected by sign",
      "tags": [
        "common-gender"
      ],
      "word": "lige funktion"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "unaffected by sign",
      "tags": [
        "feminine"
      ],
      "word": "fonction paire"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "unaffected by sign",
      "tags": [
        "feminine"
      ],
      "word": "gerade Funktion"
    },
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "unaffected by sign",
      "tags": [
        "neuter"
      ],
      "word": "jafnstætt fall"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "unaffected by sign",
      "tags": [
        "feminine"
      ],
      "word": "funkcja parzysta"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "čótnaja fúnkcija",
      "sense": "unaffected by sign",
      "tags": [
        "feminine"
      ],
      "word": "чётная фу́нкция"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "unaffected by sign",
      "tags": [
        "common-gender"
      ],
      "word": "jämn funktion"
    }
  ],
  "word": "even function"
}