"元旦" meaning in Vietnamese

{
  "forms": [
    {
      "form": "Nguyên đán",
      "tags": [
        "Hán-Nôm"
      ]
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Vietnamese Chữ Hán",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "roman": "Tết Nguyên Đán",
          "word": "節元旦"
        }
      ],
      "glosses": [
        "chữ Hán form of nguyên đán (“Lunar New Year or Vietnamese New Year”)."
      ],
      "id": "en-元旦-vi-character-f5TfCUaY",
      "links": [
        [
          "chữ Hán",
          "chữ Hán#Vietnamese"
        ],
        [
          "nguyên đán",
          "nguyên đán#Vietnamese:_元旦"
        ],
        [
          "Lunar New Year",
          "Lunar New Year"
        ],
        [
          "Vietnamese New Year",
          "Lunar New Year"
        ]
      ],
      "raw_tags": [
        "han"
      ]
    }
  ],
  "word": "元旦"
}

{
  "derived": [
    {
      "roman": "Tết Nguyên Đán",
      "word": "節元旦"
    }
  ],
  "forms": [
    {
      "form": "Nguyên đán",
      "tags": [
        "Hán-Nôm"
      ]
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Vietnamese Chữ Hán",
        "Vietnamese Han characters",
        "Vietnamese Han characters with unconfirmed readings",
        "Vietnamese lemmas",
        "Vietnamese links with redundant wikilinks"
      ],
      "glosses": [
        "chữ Hán form of nguyên đán (“Lunar New Year or Vietnamese New Year”)."
      ],
      "links": [
        [
          "chữ Hán",
          "chữ Hán#Vietnamese"
        ],
        [
          "nguyên đán",
          "nguyên đán#Vietnamese:_元旦"
        ],
        [
          "Lunar New Year",
          "Lunar New Year"
        ],
        [
          "Vietnamese New Year",
          "Lunar New Year"
        ]
      ],
      "raw_tags": [
        "han"
      ]
    }
  ],
  "word": "元旦"
}