"closed time loop" meaning in English

{
  "forms": [
    {
      "form": "closed time loops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed time loop (plural closed time loops)",
      "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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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Science fiction",
          "orig": "en:Science fiction",
          "parents": [
            "Fiction",
            "Speculative fiction",
            "Artistic works",
            "Genres",
            "Art",
            "Entertainment",
            "Culture",
            "Society",
            "All topics",
            "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": [
        "A chain of events in which someone or something time travels to the past as a means to fulfill their role in the history exactly as it already happened, thus implying impossibility to change the past."
      ],
      "id": "en-closed_time_loop-en-noun-cs8k4Y4W",
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "chain",
          "chain"
        ],
        [
          "event",
          "event"
        ],
        [
          "time travel",
          "time travel"
        ],
        [
          "past",
          "past"
        ],
        [
          "fulfill",
          "fulfill"
        ],
        [
          "role",
          "role"
        ],
        [
          "history",
          "history"
        ],
        [
          "change",
          "change"
        ]
      ],
      "raw_glosses": [
        "(science fiction) A chain of events in which someone or something time travels to the past as a means to fulfill their role in the history exactly as it already happened, thus implying impossibility to change the past."
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "word": "closed time loop"
}

{
  "forms": [
    {
      "form": "closed time loops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "closed time loop (plural closed time loops)",
      "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 entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "en:Science fiction",
        "en:Time travel"
      ],
      "glosses": [
        "A chain of events in which someone or something time travels to the past as a means to fulfill their role in the history exactly as it already happened, thus implying impossibility to change the past."
      ],
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "chain",
          "chain"
        ],
        [
          "event",
          "event"
        ],
        [
          "time travel",
          "time travel"
        ],
        [
          "past",
          "past"
        ],
        [
          "fulfill",
          "fulfill"
        ],
        [
          "role",
          "role"
        ],
        [
          "history",
          "history"
        ],
        [
          "change",
          "change"
        ]
      ],
      "raw_glosses": [
        "(science fiction) A chain of events in which someone or something time travels to the past as a means to fulfill their role in the history exactly as it already happened, thus implying impossibility to change the past."
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "word": "closed time loop"
}