Quire

A quire may be either:

• a measure of quantity of paper. This has varied through history between 4 and 25 sheets - it is now settled as one twentieth of a ream, although a ream also has varied. French and Italian paper-makers sold 25 sheets in a quire; English and Dutch only sold 24 sheets. The standard measure now is 25 sheets to the quire, 20 quires to the ream =500 sheets in a ream.
• An almost obsolete spelling of choir.