I. ream 1 /riːm/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: raime , from Arabic rizmah 'things tied together' ]
1 . reams [plural] informal a large amount of writing on paper
reams of
reams of notes
2 . technical a standard amount of paper, 500 pieces in the US or 480 pieces in Britain
II. ream 2 BrE AmE verb [transitive]
[ Date: 1700-1800 ; Origin: Perhaps from Old English reman 'to open up, make wider' ]
American English informal to treat someone badly, especially by cheating