"Brillouin function" meaning in English

{
  "etymology_text": "Named after the physicist Léon Brillouin (1889–1969).",
  "forms": [
    {
      "form": "Brillouin functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Brillouin function (plural Brillouin functions)",
      "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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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Functions",
          "orig": "en:Functions",
          "parents": [
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            "Calculus",
            "Geometry",
            "Mathematical analysis",
            "Mathematics",
            "Formal sciences",
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          "source": "w"
        }
      ],
      "glosses": [
        "A special function that appears when studying an idealized paramagnetic material in statistical mechanics."
      ],
      "id": "en-Brillouin_function-en-noun--yuCSYB3",
      "links": [
        [
          "special",
          "special"
        ],
        [
          "function",
          "function"
        ],
        [
          "idealized",
          "idealized"
        ],
        [
          "paramagnetic",
          "paramagnetic"
        ],
        [
          "material",
          "material"
        ],
        [
          "statistical mechanics",
          "statistical mechanics"
        ]
      ],
      "wikipedia": [
        "Brillouin function",
        "Léon Brillouin"
      ]
    }
  ],
  "word": "Brillouin function"
}

{
  "etymology_text": "Named after the physicist Léon Brillouin (1889–1969).",
  "forms": [
    {
      "form": "Brillouin functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Brillouin function (plural Brillouin functions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
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      "glosses": [
        "A special function that appears when studying an idealized paramagnetic material in statistical mechanics."
      ],
      "links": [
        [
          "special",
          "special"
        ],
        [
          "function",
          "function"
        ],
        [
          "idealized",
          "idealized"
        ],
        [
          "paramagnetic",
          "paramagnetic"
        ],
        [
          "material",
          "material"
        ],
        [
          "statistical mechanics",
          "statistical mechanics"
        ]
      ],
      "wikipedia": [
        "Brillouin function",
        "Léon Brillouin"
      ]
    }
  ],
  "word": "Brillouin function"
}