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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   ton
       n 1: a United States unit of weight equivalent to 2000 pounds
            [syn: short ton, ton, net ton]
       2: a British unit of weight equivalent to 2240 pounds [syn:
          long ton, ton, gross ton]