"lost in time" meaning in English

{
  "etymology_text": "Possibly a shortening of the phrase lost in the mists of time.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "lost in time (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "56 44",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Having happened or originated in a time so long ago that it has been completely forgotten or lost."
      ],
      "id": "en-lost_in_time-en-adj-2MiZnNE0",
      "links": [
        [
          "forgotten",
          "forgotten"
        ],
        [
          "lost",
          "lost"
        ]
      ],
      "synonyms": [
        {
          "word": "missing in time"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    },
    {
      "categories": [
        {
          "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"
        },
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "42 58",
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "8 92",
          "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+disamb"
        }
      ],
      "glosses": [
        "Lost during time travel."
      ],
      "id": "en-lost_in_time-en-adj-a~vSiG95",
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "time travel",
          "time travel"
        ]
      ],
      "raw_glosses": [
        "(science fiction) Lost during time travel."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "word": "lost in time"
}

{
  "categories": [
    "English adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English uncomparable adjectives",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Time",
    "en:Time travel"
  ],
  "etymology_text": "Possibly a shortening of the phrase lost in the mists of time.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "lost in time (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "Having happened or originated in a time so long ago that it has been completely forgotten or lost."
      ],
      "links": [
        [
          "forgotten",
          "forgotten"
        ],
        [
          "lost",
          "lost"
        ]
      ],
      "synonyms": [
        {
          "word": "missing in time"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    },
    {
      "categories": [
        "en:Science fiction"
      ],
      "glosses": [
        "Lost during time travel."
      ],
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "time travel",
          "time travel"
        ]
      ],
      "raw_glosses": [
        "(science fiction) Lost during time travel."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "word": "lost in time"
}