"Low Sunday" meaning in English

{
  "etymology_text": "Likely in contrast to the solemnity of the preceding Easter Sunday.",
  "head_templates": [
    {
      "args": {
        "head": "Low Sunday"
      },
      "expansion": "Low Sunday",
      "name": "en-proper noun"
    }
  ],
  "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Holidays",
          "orig": "en:Holidays",
          "parents": [
            "Observances",
            "Calendar",
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The Sunday following Easter."
      ],
      "id": "en-Low_Sunday-en-name-47IOV4Mz",
      "links": [
        [
          "Sunday",
          "Sunday"
        ],
        [
          "Easter",
          "Easter"
        ]
      ],
      "raw_glosses": [
        "(ecclesiastical) The Sunday following Easter."
      ],
      "synonyms": [
        {
          "word": "Alb Sunday"
        },
        {
          "topics": [
            "Roman-Catholicism",
            "Catholicism",
            "Christianity"
          ],
          "word": "Divine Mercy Sunday"
        },
        {
          "word": "Quasimodo"
        },
        {
          "word": "White Sunday"
        }
      ],
      "topics": [
        "ecclesiastical",
        "lifestyle",
        "religion"
      ]
    }
  ],
  "word": "Low Sunday"
}

{
  "etymology_text": "Likely in contrast to the solemnity of the preceding Easter Sunday.",
  "head_templates": [
    {
      "args": {
        "head": "Low Sunday"
      },
      "expansion": "Low Sunday",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English ecclesiastical terms",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Holidays"
      ],
      "glosses": [
        "The Sunday following Easter."
      ],
      "links": [
        [
          "Sunday",
          "Sunday"
        ],
        [
          "Easter",
          "Easter"
        ]
      ],
      "raw_glosses": [
        "(ecclesiastical) The Sunday following Easter."
      ],
      "topics": [
        "ecclesiastical",
        "lifestyle",
        "religion"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Alb Sunday"
    },
    {
      "topics": [
        "Roman-Catholicism",
        "Catholicism",
        "Christianity"
      ],
      "word": "Divine Mercy Sunday"
    },
    {
      "word": "Quasimodo"
    },
    {
      "word": "White Sunday"
    }
  ],
  "word": "Low Sunday"
}