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English definition of “mystery”

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mystery

noun uk   /ˈmɪs.tər.i/ us    /-tɚ-/

mystery noun (STRANGE/UNKNOWN THING)

B1 [C or U] something strange or not known that has not yet been explained or understood: How the massive stones were brought here from hundreds of miles away is/remains a mystery. The mystery was solved when the police discovered the murder weapon. The book tries to explain some of the mysteries of life. The details of the scandal remain cloaked/shrouded/wrapped in mystery. It's a complete mystery (to me) that/why (= I do not understand why) she married him at all!
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mystery noun (BOOK/ FILM/PLAY)

[C] a book, film, or play, especially about a crime or a murder, with a surprise ending that explains all the strange events that have happened: I really enjoy murder mysteries. a mystery writer
(Definition of mystery from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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