"mystery cult" meaning in English

{
  "forms": [
    {
      "form": "mystery cults",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mystery cult (plural mystery cults)",
      "name": "en-noun"
    }
  ],
  "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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          "source": "w"
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          "source": "w"
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
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      "examples": [
        {
          "ref": "1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 210:",
          "text": "The mystery cult of Isis in Roman Egypt was an attempt to harken back to the religion of the New Kingdom, which itself was trying to harken back to the religion of the Old Kingdom.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Any of various ancient religious movements in which initiates undergo secret rites to achieve unification with the godhead."
      ],
      "id": "en-mystery_cult-en-noun-xME5AoMj",
      "links": [
        [
          "ancient",
          "ancient"
        ],
        [
          "religious",
          "religious"
        ],
        [
          "initiate",
          "initiate"
        ],
        [
          "rite",
          "rite"
        ],
        [
          "godhead",
          "godhead"
        ]
      ]
    }
  ],
  "word": "mystery cult"
}

{
  "forms": [
    {
      "form": "mystery cults",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mystery cult (plural mystery cults)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
        "Pages with entries"
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      "examples": [
        {
          "ref": "1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 210:",
          "text": "The mystery cult of Isis in Roman Egypt was an attempt to harken back to the religion of the New Kingdom, which itself was trying to harken back to the religion of the Old Kingdom.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Any of various ancient religious movements in which initiates undergo secret rites to achieve unification with the godhead."
      ],
      "links": [
        [
          "ancient",
          "ancient"
        ],
        [
          "religious",
          "religious"
        ],
        [
          "initiate",
          "initiate"
        ],
        [
          "rite",
          "rite"
        ],
        [
          "godhead",
          "godhead"
        ]
      ]
    }
  ],
  "word": "mystery cult"
}