Y

Universal Words noun, abbreviation noun (also y) (plural Y's, y's ) 1 [C,U] the 25th letter of the English alphabet: 'Year' begins with (a) Y / 'Y'. 2 [U] (mathematics) used to represent a number whose value is not mentioned: Can the value of y be predicted from the value of x? 3 [U] a person, a number, an influence, etc. that is not known or not named: Let's suppose X knows what Y is doing. seealsoYCHROMOSOME, Y-FRONTS abbreviation (the Y) (AmE, informal) YMCA, YWCA