y - definition and synonyms

noun [countable/uncountable] 

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/waɪ/
singulary
pluraly’s
singularY
pluralY’s

or Y 

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  1. 1
    the 25th letter of the English alphabet. Y is a consonant.
     Synonyms and related words
  2. 2
    maths used in mathematics for showing a number whose value you do not know

    In the following equation, Y equals 12.