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):

Mt
    n 1: a radioactive transuranic element [syn: meitnerium, Mt,
         element 109, atomic number 109]
    2: a unit of weight equivalent to 1000 kilograms [syn: metric
       ton, MT, tonne, t]
    3: a state in northwestern United States on the Canadian border
       [syn: Montana, Treasure State, MT]
    4: the use of computers to translate from one language to
       another [syn: machine translation, MT]

The Free On-line Dictionary of Computing (19 January 2023):

mt

    The country code for Malta.

   (1999-01-27)