Meaning of Y in English

Y

n. (also y) (pl. Ys or Y's) 1 the twenty-fifth letter of the alphabet. 2 (usu. y) Algebra the second unknown quantity. 3 Geom. the second coordinate. 4 a a Y-shaped thing, esp. an arrangement of lines, piping, roads, etc. b a forked clamp or support.

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.