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mystery

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noun mystery pronunciation in American English /ˈmɪst(ə)ri/ 
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singularmystery
pluralmysteries
  1. 1
    [countable] something that you are not able to understand, explain, or get information about

    I just can't think who she could have been – it's a mystery.

    The exact origin of the universe remains a mystery.

    solve/unravel a mystery (=explain it):

    The police are trying to unravel the mystery of his disappearance.

    be a mystery to someone:

    Why she left is still a mystery to him.

  2. 2
    [uncountable] a quality that makes someone or something difficult to explain, understand, or get information about, especially when it also makes them seem interesting or exciting
    air/aura of mystery:

    a woman with an air of mystery about her

    shrouded/cloaked in mystery:

    His past is shrouded in mystery.

  3. 4

    mysteries

    [plural] often humorous information about a subject or activity that only some people are allowed to know
    mystery of:

    You'll learn all about the mysteries of the darkroom and printing processes.

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