"Advent Sunday" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "Advent Sunday",
      "name": "en-proper noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "name": "Terms with Swedish translations",
          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Calendar",
          "orig": "en:Calendar",
          "parents": [
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "The fourth Sunday before Christmas Day, the start of Advent: 30 November (Saint Andrew's Day) or the nearest Sunday to it."
      ],
      "holonyms": [
        {
          "word": "Christmas season"
        }
      ],
      "id": "en-Advent_Sunday-en-name-Ij4O-dSX",
      "links": [
        [
          "Sunday",
          "Sunday"
        ],
        [
          "Christmas Day",
          "Christmas Day"
        ],
        [
          "Advent",
          "Advent"
        ],
        [
          "Saint Andrew's Day",
          "Saint Andrew's Day"
        ]
      ],
      "related": [
        {
          "word": "Advent"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "fourth Sunday before Christmas Day, the start of Advent",
          "word": "adventtisunnuntai"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "fourth Sunday before Christmas Day, the start of Advent",
          "tags": [
            "masculine"
          ],
          "word": "Adventssonntag"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "fourth Sunday before Christmas Day, the start of Advent",
          "tags": [
            "common-gender"
          ],
          "word": "adventssöndag"
        }
      ],
      "wikipedia": [
        "Advent Sunday"
      ]
    }
  ],
  "word": "Advent Sunday"
}

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    {
      "args": {},
      "expansion": "Advent Sunday",
      "name": "en-proper noun"
    }
  ],
  "holonyms": [
    {
      "word": "Christmas season"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Advent"
    }
  ],
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        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Swedish translations",
        "en:Calendar"
      ],
      "glosses": [
        "The fourth Sunday before Christmas Day, the start of Advent: 30 November (Saint Andrew's Day) or the nearest Sunday to it."
      ],
      "links": [
        [
          "Sunday",
          "Sunday"
        ],
        [
          "Christmas Day",
          "Christmas Day"
        ],
        [
          "Advent",
          "Advent"
        ],
        [
          "Saint Andrew's Day",
          "Saint Andrew's Day"
        ]
      ],
      "wikipedia": [
        "Advent Sunday"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "fourth Sunday before Christmas Day, the start of Advent",
      "word": "adventtisunnuntai"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "fourth Sunday before Christmas Day, the start of Advent",
      "tags": [
        "masculine"
      ],
      "word": "Adventssonntag"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "fourth Sunday before Christmas Day, the start of Advent",
      "tags": [
        "common-gender"
      ],
      "word": "adventssöndag"
    }
  ],
  "word": "Advent Sunday"
}