"keyest" meaning in English

{
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        "1": "en",
        "2": "superlative adjective"
      },
      "expansion": "keyest",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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          "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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      ],
      "examples": [
        {
          "ref": "1980, Association of Research Libraries, Minutes of the Meeting, page 57",
          "text": "[…] the key library associations and organizations, of which ARL is the keyest of the key.",
          "type": "quotation"
        },
        {
          "ref": "2013, Ted Cox, 1,001 Days in the Bleachers: A Quarter Century of Chicago Sports, page 70",
          "text": "Yet to my way of thinking the keyest key player was pitcher Jose Contreras, and the pivotal game in the Sox' championship season was the series finale against the Yankees in August.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "extra": "most key",
          "word": "key"
        }
      ],
      "glosses": [
        "superlative form of key: most key"
      ],
      "id": "en-keyest-en-adj-lQZBD9LP",
      "links": [
        [
          "key",
          "key#English"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
      ]
    }
  ],
  "word": "keyest"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "superlative adjective"
      },
      "expansion": "keyest",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English non-lemma forms",
        "English superlative adjectives",
        "English terms with quotations",
        "Quotation templates to be cleaned"
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      "examples": [
        {
          "ref": "1980, Association of Research Libraries, Minutes of the Meeting, page 57",
          "text": "[…] the key library associations and organizations, of which ARL is the keyest of the key.",
          "type": "quotation"
        },
        {
          "ref": "2013, Ted Cox, 1,001 Days in the Bleachers: A Quarter Century of Chicago Sports, page 70",
          "text": "Yet to my way of thinking the keyest key player was pitcher Jose Contreras, and the pivotal game in the Sox' championship season was the series finale against the Yankees in August.",
          "type": "quotation"
        }
      ],
      "form_of": [
        {
          "extra": "most key",
          "word": "key"
        }
      ],
      "glosses": [
        "superlative form of key: most key"
      ],
      "links": [
        [
          "key",
          "key#English"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
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    }
  ],
  "word": "keyest"
}