The Collaborative International Dictionary of English v.0.48:

Metric ton \Met"ric ton\
   A weight of 1,000 kilograms, or 2,204.6 pounds avoirdupois.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

MT \MT\ n.
   A metric ton, a unit of weight equivalent to 1000
   kilograms. [abbr.]

   Syn: metric ton, tonne, t.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

metric ton
    n 1: a unit of weight equivalent to 1000 kilograms [syn: metric
         ton, MT, tonne, t]