Source : WordNet®

CIS
     n : an alliance made up of states that had been Soviet Socialist
         Republics in the Soviet Union prior to its dissolution in
         Dec 1991 [syn: {Commonwealth of Independent States}]

Source : Free On-Line Dictionary of Computing

CIS
     
        1.  {Case Integration Services}.
     
        2.  {Cooperative Information System}.
     
        3.  {Customer Interaction Software},
        {Customer Information Systems}.
     
        (1999-10-04)