Definition of Y noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//waɪ//
    ; NAmE NAmE//waɪ//
    (also y) (pl. Ys, Y’s, y’s
    BrE BrE//waɪz//
    ; NAmE 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.
  4. see also Y chromosome, Y-Fronts™
See the Oxford Advanced American Dictionary entry: Y