Y

y UK [waɪ] / US or Y UK / US noun [countable/uncountable]
Word forms "y":
singular y plural y's
Word forms "Y":
singular Y plural Y's

1) the 25th letter of the English alphabet. Y is a consonant.

2) maths used in mathematics for showing a number whose value you do not know

In the following equation, Y equals 12.

•

See:

Y-chromosome, Y-fronts