A mystery is something that is difficult or impossible to understand or explain, at least for now. It can also mean a story, especially a book or movie, about a crime or puzzling event that needs to be solved.
From Old French *mistere*, from Latin *mysterium*, from Greek *mysterion* “secret rite, hidden doctrine,” related to *myein* “to close the eyes or lips.” Originally the word referred to religious secrets known only to initiates.
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