"impossible event" meaning in English

{
  "forms": [
    {
      "form": "impossible events",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "impossible event (plural impossible events)",
      "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"
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          "source": "w"
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          "parents": [],
          "source": "w"
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          "name": "Terms with Mandarin translations",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Probability theory",
          "orig": "en:Probability theory",
          "parents": [
            "Mathematical analysis",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An event that contains no possible outcomes and thus cannot possibly occur; an empty set."
      ],
      "id": "en-impossible_event-en-noun-W8YjVbEv",
      "links": [
        [
          "probability theory",
          "probability theory"
        ],
        [
          "event",
          "event"
        ],
        [
          "contain",
          "contain"
        ],
        [
          "possible",
          "possible"
        ],
        [
          "outcome",
          "outcome"
        ],
        [
          "possibly",
          "possibly"
        ],
        [
          "occur",
          "occur"
        ],
        [
          "empty set",
          "empty set"
        ]
      ],
      "raw_glosses": [
        "(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set."
      ],
      "topics": [
        "mathematics",
        "probability-theory",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "bùkěnéng shìjiàn",
          "sense": "event that cannot occur",
          "word": "不可能事件"
        }
      ]
    }
  ],
  "word": "impossible event"
}

{
  "forms": [
    {
      "form": "impossible events",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "impossible event (plural impossible events)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
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        "Mandarin terms with redundant transliterations",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Mandarin translations",
        "en:Probability theory"
      ],
      "glosses": [
        "An event that contains no possible outcomes and thus cannot possibly occur; an empty set."
      ],
      "links": [
        [
          "probability theory",
          "probability theory"
        ],
        [
          "event",
          "event"
        ],
        [
          "contain",
          "contain"
        ],
        [
          "possible",
          "possible"
        ],
        [
          "outcome",
          "outcome"
        ],
        [
          "possibly",
          "possibly"
        ],
        [
          "occur",
          "occur"
        ],
        [
          "empty set",
          "empty set"
        ]
      ],
      "raw_glosses": [
        "(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set."
      ],
      "topics": [
        "mathematics",
        "probability-theory",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "bùkěnéng shìjiàn",
      "sense": "event that cannot occur",
      "word": "不可能事件"
    }
  ],
  "word": "impossible event"
}