"yestermillennium" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "yestermillennium (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "alt_of": [
        {
          "word": "yester-millennium"
        }
      ],
      "categories": [
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          "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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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
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      ],
      "glosses": [
        "Alternative form of yester-millennium"
      ],
      "id": "en-yestermillennium-en-adv-xVutYv5q",
      "links": [
        [
          "yester-millennium",
          "yester-millennium#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "not-comparable"
      ]
    }
  ],
  "word": "yestermillennium"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "yestermillennium (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "alt_of": [
        {
          "word": "yester-millennium"
        }
      ],
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English uncomparable adverbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Alternative form of yester-millennium"
      ],
      "links": [
        [
          "yester-millennium",
          "yester-millennium#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "not-comparable"
      ]
    }
  ],
  "word": "yestermillennium"
}