"Ice Age" meaning in English

{
  "forms": [
    {
      "form": "Ice Ages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Ice Age"
      },
      "expansion": "Ice Age (plural Ice Ages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "ice age"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015, Kevin Revolinski, 60 Hikes Within 60 Miles: Madison (page 116)",
          "text": "[…] and the sloping collection of fractured rocks—known as talus—that tumbled down from the quartzite bluffs during the repeated freezings and unfreezings of the last Ice Age."
        }
      ],
      "glosses": [
        "Alternative letter-case form of ice age"
      ],
      "id": "en-Ice_Age-en-noun-SW6eeabh",
      "links": [
        [
          "ice age",
          "ice age#English"
        ]
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "Ice Age"
}

{
  "forms": [
    {
      "form": "Ice Ages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Ice Age"
      },
      "expansion": "Ice Age (plural Ice Ages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "ice age"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "examples": [
        {
          "ref": "2015, Kevin Revolinski, 60 Hikes Within 60 Miles: Madison (page 116)",
          "text": "[…] and the sloping collection of fractured rocks—known as talus—that tumbled down from the quartzite bluffs during the repeated freezings and unfreezings of the last Ice Age."
        }
      ],
      "glosses": [
        "Alternative letter-case form of ice age"
      ],
      "links": [
        [
          "ice age",
          "ice age#English"
        ]
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "Ice Age"
}