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English definition of “y”

y

noun [U] uk (also Y)   /waɪ/ us  
used to represent the second of two numbers or names that are not known or stated, when the first is represented by "x": If 2x = 3y and x = 6, then y = 4. The children on trial were referred to as child X and child Y.Mathematical symbols
(Definition of y noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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