"master spirit" meaning in English

{
  "forms": [
    {
      "form": "master spirits",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "master spirit (plural master spirits)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2006, Clive James, North Face of Soho, Picador, published 2007, page 166:",
          "text": "The editor could have been William Davis, a man with the same Teutonic origins as Werner von Braun, although not as funny. Either way, Coren was the master spirit.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The leading entity; the most important person, the controlling figure."
      ],
      "id": "en-master_spirit-en-noun-NAwGZ0Vi",
      "links": [
        [
          "entity",
          "entity"
        ]
      ]
    }
  ],
  "word": "master spirit"
}

{
  "forms": [
    {
      "form": "master spirits",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "master spirit (plural master spirits)",
      "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",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2006, Clive James, North Face of Soho, Picador, published 2007, page 166:",
          "text": "The editor could have been William Davis, a man with the same Teutonic origins as Werner von Braun, although not as funny. Either way, Coren was the master spirit.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The leading entity; the most important person, the controlling figure."
      ],
      "links": [
        [
          "entity",
          "entity"
        ]
      ]
    }
  ],
  "word": "master spirit"
}