"mega-colossal" meaning in English

{
  "etymology_templates": [
    {
      "args": {
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        "2": "mega",
        "3": "colossal"
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      "expansion": "mega- + colossal",
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  ],
  "etymology_text": "mega- + colossal",
  "head_templates": [
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      "expansion": "mega-colossal (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
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        {
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          "name": "English terms prefixed with mega-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Volcanology",
          "orig": "en:Volcanology",
          "parents": [
            "Geology",
            "Earth sciences",
            "Sciences",
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            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "Describing the very largest type of volcanic eruption, the kind that would be expected to happen less than once in ten thousand years."
      ],
      "id": "en-mega-colossal-en-adj-vznClbiS",
      "links": [
        [
          "volcanic",
          "volcanic#English"
        ],
        [
          "eruption",
          "eruption#English"
        ]
      ],
      "synonyms": [
        {
          "word": "megacolossal"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "mégacolossal"
        }
      ],
      "wikipedia": [
        "Volcanic explosivity index"
      ]
    }
  ],
  "word": "mega-colossal"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "colossal"
      },
      "expansion": "mega- + colossal",
      "name": "prefix"
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  ],
  "etymology_text": "mega- + colossal",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "mega-colossal (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        "en:Volcanology"
      ],
      "glosses": [
        "Describing the very largest type of volcanic eruption, the kind that would be expected to happen less than once in ten thousand years."
      ],
      "links": [
        [
          "volcanic",
          "volcanic#English"
        ],
        [
          "eruption",
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        ]
      ],
      "tags": [
        "not-comparable"
      ],
      "wikipedia": [
        "Volcanic explosivity index"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "megacolossal"
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "mégacolossal"
    }
  ],
  "word": "mega-colossal"
}