"Bessel function" meaning in English

{
  "etymology_text": "For Friedrich Bessel, German mathematician.",
  "forms": [
    {
      "form": "Bessel functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Bessel function"
      },
      "expansion": "Bessel function (plural Bessel functions)",
      "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",
            "Entry maintenance"
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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"
        }
      ],
      "glosses": [
        "Any of a class of functions that are solutions to a particular form of differential equation (a Bessel equation) and are typically used to describe waves in a cylindrically symmetric system."
      ],
      "hypernyms": [
        {
          "word": "function"
        }
      ],
      "hyponyms": [
        {
          "word": "modified Bessel function"
        },
        {
          "word": "Riccati-Bessel function"
        },
        {
          "word": "spherical Bessel function"
        }
      ],
      "id": "en-Bessel_function-en-noun-txv-9V2N",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "solution",
          "solution"
        ],
        [
          "differential equation",
          "differential equation"
        ],
        [
          "Bessel equation",
          "Bessel equation"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Any of a class of functions that are solutions to a particular form of differential equation (a Bessel equation) and are typically used to describe waves in a cylindrically symmetric system."
      ],
      "related": [
        {
          "word": "Bessel function of the first kind"
        },
        {
          "word": "Bessel function of the second kind"
        }
      ],
      "synonyms": [
        {
          "word": "cylinder function"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "Besselfunktion"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "funkcja Bessela"
        },
        {
          "code": "tr",
          "lang": "Turkish",
          "sense": "Translations",
          "word": "Bessel funksyonu"
        }
      ],
      "wikipedia": [
        "Bessel function",
        "Friedrich Bessel"
      ]
    }
  ],
  "word": "Bessel function"
}

{
  "etymology_text": "For Friedrich Bessel, German mathematician.",
  "forms": [
    {
      "form": "Bessel functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Bessel function"
      },
      "expansion": "Bessel function (plural Bessel functions)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "function"
    }
  ],
  "hyponyms": [
    {
      "word": "modified Bessel function"
    },
    {
      "word": "Riccati-Bessel function"
    },
    {
      "word": "spherical Bessel function"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Bessel function of the first kind"
    },
    {
      "word": "Bessel function of the second kind"
    }
  ],
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English entries with topic categories using raw markup",
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        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "Translation table header lacks gloss",
        "en:Functions",
        "en:Mathematics"
      ],
      "glosses": [
        "Any of a class of functions that are solutions to a particular form of differential equation (a Bessel equation) and are typically used to describe waves in a cylindrically symmetric system."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "solution",
          "solution"
        ],
        [
          "differential equation",
          "differential equation"
        ],
        [
          "Bessel equation",
          "Bessel equation"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Any of a class of functions that are solutions to a particular form of differential equation (a Bessel equation) and are typically used to describe waves in a cylindrically symmetric system."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Bessel function",
        "Friedrich Bessel"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "cylinder function"
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Besselfunktion"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "funkcja Bessela"
    },
    {
      "code": "tr",
      "lang": "Turkish",
      "sense": "Translations",
      "word": "Bessel funksyonu"
    }
  ],
  "word": "Bessel function"
}