"megamillennium" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "millennium"
      },
      "expansion": "mega- + millennium",
      "name": "prefix"
    }
  ],
  "etymology_text": "From mega- + millennium.",
  "forms": [
    {
      "form": "megamillennia",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "megamillenniums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "megamillennia",
        "2": "s"
      },
      "expansion": "megamillennium (plural megamillennia or megamillenniums)",
      "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": "English terms prefixed with mega-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -ium",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Thousand",
          "orig": "en:Thousand",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A period of time consisting of a million years."
      ],
      "id": "en-megamillennium-en-noun-BnDX2Yrx",
      "links": [
        [
          "period",
          "period"
        ],
        [
          "time",
          "time"
        ],
        [
          "year",
          "year"
        ]
      ]
    }
  ],
  "word": "megamillennium"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "millennium"
      },
      "expansion": "mega- + millennium",
      "name": "prefix"
    }
  ],
  "etymology_text": "From mega- + millennium.",
  "forms": [
    {
      "form": "megamillennia",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "megamillenniums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "megamillennia",
        "2": "s"
      },
      "expansion": "megamillennium (plural megamillennia or megamillenniums)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms prefixed with mega-",
        "English terms suffixed with -ium",
        "en:Thousand"
      ],
      "glosses": [
        "A period of time consisting of a million years."
      ],
      "links": [
        [
          "period",
          "period"
        ],
        [
          "time",
          "time"
        ],
        [
          "year",
          "year"
        ]
      ]
    }
  ],
  "word": "megamillennium"
}