- In modern colloquial English, a mystery is a subgenre of detective fiction (see mystery fiction).
- Mystery! is a PBS program showing British detective fiction series.
- Also in modern colloquial English, a mystery is something which is unknown.
- Originally mystery was a religious term. Thus the Sacred Mysteries were rites into which only the initiated were admitted, lest they become the object of ridicule.
- Another sense of the word mystery is defined by the Catholic Encyclopedia as "a supernatural truth ... that of its very nature lies above the finite intelligence".
- In medieval Britain, mystery meant a craft, trade or profession. Thus an apprentice to one of the guilds would be said to be learning the mysteries of that guild.
- Both of the above meanings: supernatural truth or trade may be the origin of the name mystery play applied to a form of religious drama.
- Mystery is the name of a chess engine. See Mystery (chess).
- Mystery is also one of the four cats belonging to Emily Strange. (see Mystery Strange)
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