American English

Definition of Y noun from the Oxford Advanced American Dictionary



    y (pl. Ys, Y's, y's
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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