Y 1
(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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Y 2
■ abbreviation
1》 yen.
2》 N. Amer. informal a YMCA or YWCA hostel.
■ symbol the chemical element yttrium.