Definitions from Wiktionary (mystery)

▸ noun:  Something secret or unexplainable; an unknown.
▸ noun:  Someone or something with an obscure or puzzling nature.
▸ noun:  An account, story, book, film, or play, often with the theme of crime or murder, with a surprise ending that explains all the strange events that have occurred.
▸ noun:  A mystery play.
▸ noun:  (obsolete) A secret or mystical meaning.
▸ noun:  A religious truth not understandable by the application of human reason alone (without divine aid).
▸ noun:  (archaic outside Eastern Orthodoxy) A sacrament.
▸ noun:  (chiefly in the plural) A secret religious celebration, admission to which was usually through initiation.
▸ noun:  (Catholicism) A particular event or series of events in the life of Christ.
▸ noun:  (archaic) A craft, art or trade; specifically a guild of craftsmen.

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