Y

Y¹

(also y)

noun (plural Ys or Y's)

1》 the twenty-fifth letter of the alphabet.

2》 denoting the next after X in a set of items, categories, etc.

3》 denoting an unknown or unspecified person or thing (coming second after ‘x’).

4》 (usu. y) the second unknown quantity in an algebraic expression, usually the dependent variable.

    ↘denoting the secondary or vertical axis in a system of coordinates.

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Y²

abbreviation

1》 yen.

2》 N. Amer. informal a YMCA or YWCA hostel.

symbol the chemical element yttrium.