"megaprimary" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "primary"
      },
      "expansion": "mega- + primary",
      "name": "prefix"
    }
  ],
  "etymology_text": "mega- + primary",
  "forms": [
    {
      "form": "megaprimaries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "megaprimary (plural megaprimaries)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        }
      ],
      "glosses": [
        "A primary election for president that takes place on the same day across a wide geographic area covering many voters."
      ],
      "id": "en-megaprimary-en-noun-SVUiif0E",
      "links": [
        [
          "primary election",
          "primary election"
        ],
        [
          "president",
          "president"
        ],
        [
          "geographic",
          "geographic"
        ],
        [
          "voter",
          "voter"
        ]
      ],
      "raw_glosses": [
        "(informal, US) A primary election for president that takes place on the same day across a wide geographic area covering many voters."
      ],
      "tags": [
        "US",
        "informal"
      ]
    }
  ],
  "word": "megaprimary"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mega",
        "3": "primary"
      },
      "expansion": "mega- + primary",
      "name": "prefix"
    }
  ],
  "etymology_text": "mega- + primary",
  "forms": [
    {
      "form": "megaprimaries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "megaprimary (plural megaprimaries)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English nouns",
        "English terms prefixed with mega-"
      ],
      "glosses": [
        "A primary election for president that takes place on the same day across a wide geographic area covering many voters."
      ],
      "links": [
        [
          "primary election",
          "primary election"
        ],
        [
          "president",
          "president"
        ],
        [
          "geographic",
          "geographic"
        ],
        [
          "voter",
          "voter"
        ]
      ],
      "raw_glosses": [
        "(informal, US) A primary election for president that takes place on the same day across a wide geographic area covering many voters."
      ],
      "tags": [
        "US",
        "informal"
      ]
    }
  ],
  "word": "megaprimary"
}