Source : Free On-Line Dictionary of Computing

knowledge-based system
     
         (KBS) A program for extending and/or
        querying a {knowledge base}.
     
        The related term {expert system} is normally used to refer to
        a highly domain-specific type of KBS used for a specialised
        purpose such as medical diagnosis.
     
        The {Cyc} project is an example of a large KBS.
     
        (1999-09-07)