"double feast" meaning in English

{
  "etymology_templates": [
    {
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      "expansion": "Uncertain",
      "name": "unc"
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  ],
  "etymology_text": "Uncertain; possibly because either the antiphon or the matins took place twice on such days.",
  "forms": [
    {
      "form": "double feasts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double feast (plural double feasts)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "langcode": "en",
          "name": "Christianity",
          "orig": "en:Christianity",
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        }
      ],
      "glosses": [
        "Any of certain feast days ranked above simples and semidoubles."
      ],
      "id": "en-double_feast-en-noun-1L-~FgGC",
      "links": [
        [
          "Christianity",
          "Christianity"
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        [
          "feast day",
          "feast day"
        ],
        [
          "simple",
          "simple"
        ],
        [
          "semidouble",
          "semidouble"
        ]
      ],
      "raw_glosses": [
        "(Christianity) Any of certain feast days ranked above simples and semidoubles."
      ],
      "synonyms": [
        {
          "word": "double"
        }
      ],
      "topics": [
        "Christianity"
      ]
    }
  ],
  "word": "double feast"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en"
      },
      "expansion": "Uncertain",
      "name": "unc"
    }
  ],
  "etymology_text": "Uncertain; possibly because either the antiphon or the matins took place twice on such days.",
  "forms": [
    {
      "form": "double feasts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double feast (plural double feasts)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
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        "en:Christianity"
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      "glosses": [
        "Any of certain feast days ranked above simples and semidoubles."
      ],
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        [
          "Christianity",
          "Christianity"
        ],
        [
          "feast day",
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          "simple",
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        ],
        [
          "semidouble",
          "semidouble"
        ]
      ],
      "raw_glosses": [
        "(Christianity) Any of certain feast days ranked above simples and semidoubles."
      ],
      "synonyms": [
        {
          "word": "double"
        }
      ],
      "topics": [
        "Christianity"
      ]
    }
  ],
  "word": "double feast"
}