"trettondag" meaning in Swedish

{
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "gmq-osw",
        "3": "þrættande dagher"
      },
      "expansion": "Old Swedish þrættande dagher",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Swedish þrættande dagher, equivalent to tretton + dag.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "l",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "trettondag",
      "source": "declension",
      "tags": [
        "indefinite",
        "nominative",
        "singular"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "nouns",
        "3": "",
        "g": "c",
        "g2": "",
        "head": "",
        "sort": ""
      },
      "expansion": "trettondag c",
      "name": "head"
    },
    {
      "args": {
        "1": "c"
      },
      "expansion": "trettondag c",
      "name": "sv-noun"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sv",
          "name": "Christmas",
          "orig": "sv:Christmas",
          "parents": [
            "Christianity",
            "Holidays",
            "Abrahamism",
            "Observances",
            "Religion",
            "Calendar",
            "Culture",
            "Timekeeping",
            "Society",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sv",
          "name": "Holidays",
          "orig": "sv:Holidays",
          "parents": [
            "Observances",
            "Calendar",
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "trettondagsafton"
        }
      ],
      "glosses": [
        "Epiphany (Christian holiday)"
      ],
      "id": "en-trettondag-sv-noun-6oioqLu8",
      "links": [
        [
          "Epiphany",
          "Epiphany"
        ]
      ],
      "synonyms": [
        {
          "word": "trettondedag"
        }
      ],
      "tags": [
        "common-gender"
      ]
    }
  ],
  "word": "trettondag"
}

{
  "derived": [
    {
      "word": "trettondagsafton"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "gmq-osw",
        "3": "þrættande dagher"
      },
      "expansion": "Old Swedish þrættande dagher",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Swedish þrættande dagher, equivalent to tretton + dag.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "l",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "trettondag",
      "source": "declension",
      "tags": [
        "indefinite",
        "nominative",
        "singular"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "nouns",
        "3": "",
        "g": "c",
        "g2": "",
        "head": "",
        "sort": ""
      },
      "expansion": "trettondag c",
      "name": "head"
    },
    {
      "args": {
        "1": "c"
      },
      "expansion": "trettondag c",
      "name": "sv-noun"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Swedish common-gender nouns",
        "Swedish entries with incorrect language header",
        "Swedish lemmas",
        "Swedish nouns",
        "Swedish terms derived from Old Swedish",
        "Swedish terms inherited from Old Swedish",
        "sv:Christmas",
        "sv:Holidays"
      ],
      "glosses": [
        "Epiphany (Christian holiday)"
      ],
      "links": [
        [
          "Epiphany",
          "Epiphany"
        ]
      ],
      "tags": [
        "common-gender"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "trettondedag"
    }
  ],
  "word": "trettondag"
}

{
  "called_from": "parser/328",
  "msg": "TABLE not properly closed",
  "path": [
    "trettondag"
  ],
  "section": "Swedish",
  "subsection": "noun",
  "title": "trettondag",
  "trace": "started on line 4, detected on line 34"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <div> not properly closed",
  "path": [
    "trettondag"
  ],
  "section": "Swedish",
  "subsection": "noun",
  "title": "trettondag",
  "trace": "started on line 2, detected on line 34"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </div>",
  "path": [
    "trettondag"
  ],
  "section": "Swedish",
  "subsection": "noun",
  "title": "trettondag",
  "trace": ""
}