"alternity" meaning in English

{
  "forms": [
    {
      "form": "alternities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "alternity (plural alternities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "glosses": [
        "alternation"
      ],
      "id": "en-alternity-en-noun-qQIFDFvP",
      "links": [
        [
          "alternation",
          "alternation"
        ]
      ],
      "raw_glosses": [
        "(archaic) alternation"
      ],
      "tags": [
        "archaic"
      ]
    },
    {
      "categories": [
        {
          "_dis": "31 69",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "16 84",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "9 91",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "The concept that there exist alternate worlds or universes to the one in which we live."
      ],
      "id": "en-alternity-en-noun-fnbOvAff",
      "links": [
        [
          "alternate",
          "alternate"
        ]
      ]
    }
  ],
  "word": "alternity"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "alternities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "alternity (plural alternities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with archaic senses"
      ],
      "glosses": [
        "alternation"
      ],
      "links": [
        [
          "alternation",
          "alternation"
        ]
      ],
      "raw_glosses": [
        "(archaic) alternation"
      ],
      "tags": [
        "archaic"
      ]
    },
    {
      "glosses": [
        "The concept that there exist alternate worlds or universes to the one in which we live."
      ],
      "links": [
        [
          "alternate",
          "alternate"
        ]
      ]
    }
  ],
  "word": "alternity"
}