mystery Meaning in the Cambridge English Dictionary
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Meaning of “mystery” in the English Dictionary

"mystery" in British English

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mysterynoun

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 ​massivestones were ​brought here from hundreds of ​miles away is/​remains a mystery. The mystery was solved when the ​policediscovered the ​murderweapon. The ​booktries to ​explain some of the mysteries oflife. The ​details of the ​scandalremain 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 ​surpriseending that ​explains all the ​strangeevents that have ​happened: I really ​enjoy murder mysteries. a mystery writer
(Definition of mystery from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mystery" in American English

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mysterynoun [C/U]

 us   /ˈmɪs·tə·ri/
something ​strange or ​unknown which has not ​yet been ​explained or ​understood: [C] Despite ​years of ​study, ​sleepwalkingremains a mystery. [U] The ​details of the ​scandal are ​shrouded in mystery. A mystery is also a ​book, ​movie, or ​play about a ​crime or other ​event that is ​difficult to ​explain: [C] a ​murder mystery
mysterious
adjective  us   /mɪˈstɪər·i·əs/
He ​tried to ​convince this mysterious woman to go out with him.
mysteriously
adverb  us   /mɪˈstɪər·i·əs·li/
The ​light mysteriously came on, ​although no one was near the ​switch.
(Definition of mystery from the Cambridge Academic Content Dictionary © Cambridge University Press)
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