DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   DAT \DAT\ n. [acronym, from Digital AudioTape.]
      digital audiotape, a digitally encoded tape recording of
      sound; -- in contrast to the usual analog audio tape.
      [acronym]
      [WordNet 1.5]