Definition of Y noun from the Oxford Advanced American Dictionary

     

    Y

     noun
    noun
    NAmE//waɪ//
     
    y(pl. Ys, Y's, y's
    NAmE//waɪz//
     
    )
     
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  1. 1 [countable, uncountable] the 25th letter of the English alphabet “Year” begins with (a) Y/“Y.”
  2. 2[uncountable] (mathematics) used to represent a number whose value is not mentioned Can the value of y be predicted from the value of x?
  3. 3[uncountable] a person, a number, an influence, etc. that is not known or not named Let's suppose X knows what Y is doing. see also Y chromosome
See the Oxford Advanced Learner's Dictionary entry: Y