"grandfather paradox" meaning in English

{
  "etymology_text": "From the paradox proposed by the French author René Barjavel in 1944 in his book Le Voyageur Imprudent, translated into English as \"Future Times Three\"; in its original form the paradox of one person going back to the past and killing their biological grandfather before the latter fathered the traveler's father, thus preventing the time traveler from ever being conceived in the first place.",
  "forms": [
    {
      "form": "grandfather paradoxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grandfather paradox (plural grandfather paradoxes)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Mongolian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Murder",
          "orig": "en:Murder",
          "parents": [
            "Crime",
            "Death",
            "Violence",
            "Criminal law",
            "Society",
            "Body",
            "Life",
            "Human behaviour",
            "Law",
            "All topics",
            "Nature",
            "Human",
            "Justice",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Paradoxes",
          "orig": "en:Paradoxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Suicide",
          "orig": "en:Suicide",
          "parents": [
            "Death",
            "Body",
            "Life",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Time travel",
          "orig": "en:Time travel",
          "parents": [
            "Relativity",
            "Science fiction",
            "Time",
            "Travel",
            "Physics",
            "Fiction",
            "Speculative fiction",
            "All topics",
            "Human activity",
            "Transport",
            "Sciences",
            "Artistic works",
            "Genres",
            "Fundamental",
            "Human behaviour",
            "Art",
            "Entertainment",
            "Human",
            "Culture",
            "Society"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The paradox of time travel in which inconsistencies emerge through changing the past."
      ],
      "id": "en-grandfather_paradox-en-noun-6f6rEfqh",
      "links": [
        [
          "time travel",
          "time travel"
        ],
        [
          "inconsistencies",
          "inconsistency"
        ]
      ],
      "related": [
        {
          "word": "autoinfanticide"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "type of paradox",
          "word": "isoisäparadoksi"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "type of paradox",
          "tags": [
            "neuter"
          ],
          "word": "Großvaterparadoxon"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "type of paradox",
          "tags": [
            "neuter"
          ],
          "word": "Großvater-Paradoxon"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "sense": "type of paradox",
          "word": "祖父殺しのパラドックス"
        },
        {
          "code": "mn",
          "lang": "Mongolian",
          "roman": "alagdsan övöögiin paradoks",
          "sense": "type of paradox",
          "word": "алагдсан өвөөгийн парадокс"
        },
        {
          "code": "mn",
          "lang": "Mongolian",
          "roman": "övöögiin paradoks",
          "sense": "type of paradox",
          "word": "өвөөгийн парадокс"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "paradóks ubítovo déduški",
          "sense": "type of paradox",
          "tags": [
            "masculine"
          ],
          "word": "парадо́кс уби́того де́душки"
        }
      ],
      "wikipedia": [
        "Future Times Three",
        "René Barjavel",
        "grandfather paradox"
      ]
    }
  ],
  "word": "grandfather paradox"
}

{
  "etymology_text": "From the paradox proposed by the French author René Barjavel in 1944 in his book Le Voyageur Imprudent, translated into English as \"Future Times Three\"; in its original form the paradox of one person going back to the past and killing their biological grandfather before the latter fathered the traveler's father, thus preventing the time traveler from ever being conceived in the first place.",
  "forms": [
    {
      "form": "grandfather paradoxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grandfather paradox (plural grandfather paradoxes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "autoinfanticide"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Japanese translations",
        "Terms with Mongolian translations",
        "Terms with Russian translations",
        "en:Murder",
        "en:Paradoxes",
        "en:Suicide",
        "en:Time travel"
      ],
      "glosses": [
        "The paradox of time travel in which inconsistencies emerge through changing the past."
      ],
      "links": [
        [
          "time travel",
          "time travel"
        ],
        [
          "inconsistencies",
          "inconsistency"
        ]
      ],
      "wikipedia": [
        "Future Times Three",
        "René Barjavel",
        "grandfather paradox"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "type of paradox",
      "word": "isoisäparadoksi"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "type of paradox",
      "tags": [
        "neuter"
      ],
      "word": "Großvaterparadoxon"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "type of paradox",
      "tags": [
        "neuter"
      ],
      "word": "Großvater-Paradoxon"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "sense": "type of paradox",
      "word": "祖父殺しのパラドックス"
    },
    {
      "code": "mn",
      "lang": "Mongolian",
      "roman": "alagdsan övöögiin paradoks",
      "sense": "type of paradox",
      "word": "алагдсан өвөөгийн парадокс"
    },
    {
      "code": "mn",
      "lang": "Mongolian",
      "roman": "övöögiin paradoks",
      "sense": "type of paradox",
      "word": "өвөөгийн парадокс"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "paradóks ubítovo déduški",
      "sense": "type of paradox",
      "tags": [
        "masculine"
      ],
      "word": "парадо́кс уби́того де́душки"
    }
  ],
  "word": "grandfather paradox"
}