The Collaborative International Dictionary of English v.0.48:

machine translation \ma*chine" trans*la"tion\ n. (Computers)
   The translation of human language from one language to
   another by a computer; -- a branch of artificial
   intelligence.

   Syn: computer translation, automatic translation.
        [PJC]

WordNet (r) 3.0 (2006):

machine translation
    n 1: the use of computers to translate from one language to
         another [syn: machine translation, MT]