"megaconference" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "conference"
      },
      "expansion": "mega- + conference",
      "name": "prefix"
    }
  ],
  "etymology_text": "mega- + conference",
  "forms": [
    {
      "form": "megaconferences",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "megaconference (plural megaconferences)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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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"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with mega-",
          "parents": [],
          "source": "w"
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      ],
      "examples": [
        {
          "ref": "2007 November 12, Carol Kino, “The Young and the Restless Try, Too”, in New York Times",
          "text": "In May 2008, when the Council on Foundations holds its Leadership Summit, a megaconference for philanthropists, it will offer its first full next-generation program.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A very large-scale conference."
      ],
      "id": "en-megaconference-en-noun-zlD6ELDb",
      "links": [
        [
          "conference",
          "conference"
        ]
      ]
    }
  ],
  "word": "megaconference"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "conference"
      },
      "expansion": "mega- + conference",
      "name": "prefix"
    }
  ],
  "etymology_text": "mega- + conference",
  "forms": [
    {
      "form": "megaconferences",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "megaconference (plural megaconferences)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English nouns",
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        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2007 November 12, Carol Kino, “The Young and the Restless Try, Too”, in New York Times",
          "text": "In May 2008, when the Council on Foundations holds its Leadership Summit, a megaconference for philanthropists, it will offer its first full next-generation program.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A very large-scale conference."
      ],
      "links": [
        [
          "conference",
          "conference"
        ]
      ]
    }
  ],
  "word": "megaconference"
}