"masterer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "master",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "master + -er",
      "name": "affix"
    }
  ],
  "etymology_text": "master + -er",
  "forms": [
    {
      "form": "masterers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "masterer (plural masterers)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er (agent noun)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1902, Eduard Engel, Hamley Bent, A History of English Literature (600-1900), page 477",
          "text": "Carlyle was a masterer of language, even more than a master of it.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "extra": "one who masters",
          "word": "master"
        }
      ],
      "glosses": [
        "Agent noun of master: one who masters."
      ],
      "id": "en-masterer-en-noun-GJma6jsz",
      "links": [
        [
          "Agent noun",
          "agent noun#English"
        ],
        [
          "master",
          "master#English"
        ]
      ],
      "tags": [
        "agent",
        "form-of"
      ]
    }
  ],
  "word": "masterer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "master",
        "3": "-er",
        "id2": "agent noun"
      },
      "expansion": "master + -er",
      "name": "affix"
    }
  ],
  "etymology_text": "master + -er",
  "forms": [
    {
      "form": "masterers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "masterer (plural masterers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English agent nouns",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er (agent noun)",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1902, Eduard Engel, Hamley Bent, A History of English Literature (600-1900), page 477",
          "text": "Carlyle was a masterer of language, even more than a master of it.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "extra": "one who masters",
          "word": "master"
        }
      ],
      "glosses": [
        "Agent noun of master: one who masters."
      ],
      "links": [
        [
          "Agent noun",
          "agent noun#English"
        ],
        [
          "master",
          "master#English"
        ]
      ],
      "tags": [
        "agent",
        "form-of"
      ]
    }
  ],
  "word": "masterer"
}