"extraordinary professor" meaning in English

{
  "forms": [
    {
      "form": "extraordinary professors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "extraordinary professor (plural extraordinary professors)",
      "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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          "source": "w"
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          "source": "w"
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      "examples": [
        {
          "ref": "1913, “Gustav Bickell”, in Catholic Encyclopedia (1913):",
          "text": "He then taught Oriental languages at the Academy of Münster, and in 1871 was appointed extraordinary professor.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In Germany, professor without chair, often in a side-area, or being subordinated to a professor with chair."
      ],
      "id": "en-extraordinary_professor-en-noun-bpiA2v2K",
      "wikipedia": [
        "Professor"
      ]
    }
  ],
  "word": "extraordinary professor"
}

{
  "forms": [
    {
      "form": "extraordinary professors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "extraordinary professor (plural extraordinary professors)",
      "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",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1913, “Gustav Bickell”, in Catholic Encyclopedia (1913):",
          "text": "He then taught Oriental languages at the Academy of Münster, and in 1871 was appointed extraordinary professor.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In Germany, professor without chair, often in a side-area, or being subordinated to a professor with chair."
      ],
      "wikipedia": [
        "Professor"
      ]
    }
  ],
  "word": "extraordinary professor"
}