Definition of Z noun from the Oxford Advanced American Dictionary

     

    Z

     noun
    znoun
    NAmE//zi//
     
    (pl. Zs, Z's, z's
    NAmE//ziz//
     
    )
     
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  1. 1 [countable, uncountable] the 26th and last letter of the English alphabet “Zebra” begins with (a) Z/“Z.”
  2. 2 Z's [plural] (informal) (humorous) sleep I need to catch some Z's.
  3. Idioms
    from A to Z
     
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    including everything there is to know about something He knew his subject from A to Z.
See the Oxford Advanced Learner's Dictionary entry: Z

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