"national convention" meaning in English

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      "expansion": "national convention (plural national conventions)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "American English",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Politics",
          "orig": "en:Politics",
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            "Society",
            "All topics",
            "Fundamental"
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        }
      ],
      "glosses": [
        "A meeting of the major figures in a political party to outline a party platform, set party rules, select a nominee for president as well as rally supporters."
      ],
      "id": "en-national_convention-en-noun-5RknNo~A",
      "links": [
        [
          "politics",
          "politics"
        ],
        [
          "political party",
          "political party"
        ],
        [
          "platform",
          "platform"
        ],
        [
          "rule",
          "rule"
        ],
        [
          "president",
          "president"
        ]
      ],
      "raw_glosses": [
        "(US, politics) A meeting of the major figures in a political party to outline a party platform, set party rules, select a nominee for president as well as rally supporters."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "meeting to outline party platform",
          "word": "puoluekokous"
        }
      ],
      "wikipedia": [
        "United States presidential nominating convention"
      ]
    }
  ],
  "word": "national convention"
}

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      "form": "national conventions",
      "tags": [
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      "expansion": "national convention (plural national conventions)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Politics"
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      "glosses": [
        "A meeting of the major figures in a political party to outline a party platform, set party rules, select a nominee for president as well as rally supporters."
      ],
      "links": [
        [
          "politics",
          "politics"
        ],
        [
          "political party",
          "political party"
        ],
        [
          "platform",
          "platform"
        ],
        [
          "rule",
          "rule"
        ],
        [
          "president",
          "president"
        ]
      ],
      "raw_glosses": [
        "(US, politics) A meeting of the major figures in a political party to outline a party platform, set party rules, select a nominee for president as well as rally supporters."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "wikipedia": [
        "United States presidential nominating convention"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "meeting to outline party platform",
      "word": "puoluekokous"
    }
  ],
  "word": "national convention"
}