Ream (rm) (1)
Ream (rm) (1) :
A traditional unit of quantity used for counting sheets of paper. The word is thought to be derived from the Arabic rizmah, meaning a bundle. A ream is equal to 20 quires, which would be 480 sheets with the traditional definition of a quire as 24 sheets. In recent years, however, the ream has been redefined to equal 500 sheets. (Working backwards, this changes the definition of a quire from 24 to 25 sheets.) The new definition reflects the current practice of marketing many kinds of paper in packages of 500 sheets. The older size of 480 sheets is now called a short ream
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