"masterminder" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mastermind",
        "3": "er"
      },
      "expansion": "mastermind + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "From mastermind + -er.",
  "forms": [
    {
      "form": "masterminders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "masterminder (plural masterminders)",
      "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 terms suffixed with -er",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "One who masterminds; a planner of a complex operation."
      ],
      "id": "en-masterminder-en-noun-cesfWUbO",
      "links": [
        [
          "mastermind",
          "mastermind"
        ],
        [
          "planner",
          "planner"
        ]
      ],
      "raw_glosses": [
        "(rare) One who masterminds; a planner of a complex operation."
      ],
      "synonyms": [
        {
          "word": "mastermind"
        }
      ],
      "tags": [
        "rare"
      ]
    }
  ],
  "word": "masterminder"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mastermind",
        "3": "er"
      },
      "expansion": "mastermind + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "From mastermind + -er.",
  "forms": [
    {
      "form": "masterminders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "masterminder (plural masterminders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "English terms with rare senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "One who masterminds; a planner of a complex operation."
      ],
      "links": [
        [
          "mastermind",
          "mastermind"
        ],
        [
          "planner",
          "planner"
        ]
      ],
      "raw_glosses": [
        "(rare) One who masterminds; a planner of a complex operation."
      ],
      "tags": [
        "rare"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "mastermind"
    }
  ],
  "word": "masterminder"
}