"Knightian uncertainty" meaning in English

{
  "etymology_text": "Named after University of Chicago economist Frank Knight (1885–1972).",
  "forms": [
    {
      "form": "Knightian uncertainties",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "Knightian uncertainty (countable and uncountable, plural Knightian uncertainties)",
      "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"
        },
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          "parents": [],
          "source": "w"
        },
        {
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        }
      ],
      "glosses": [
        "A lack of any quantifiable knowledge about some possible occurrence, as opposed to the presence of quantifiable risk."
      ],
      "id": "en-Knightian_uncertainty-en-noun-erTQn4WI",
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "Knightian uncertainty"
}

{
  "etymology_text": "Named after University of Chicago economist Frank Knight (1885–1972).",
  "forms": [
    {
      "form": "Knightian uncertainties",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "Knightian uncertainty (countable and uncountable, plural Knightian uncertainties)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A lack of any quantifiable knowledge about some possible occurrence, as opposed to the presence of quantifiable risk."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "Knightian uncertainty"
}