Source : WordNet®

communication system
     n 1: a system for communicating
     2: facility consisting of the physical plants and equipment for
        disseminating information [syn: {communication equipment}]

Source : Free On-Line Dictionary of Computing

communication system
     
         A system or facility capable of providing
        {information} transfer between persons and equipment.  The
        system usually consists of a collection of individual
        communication {networks}, transmission systems, relay
        stations, tributary stations, and {terminal} equipment capable
        of interconnection and interoperation so as to form an
        integrated whole.  These individual components must serve a
        common purpose, be technically compatible, employ common
        procedures, respond to some form of control, and generally
        operate in unison.
     
        ["Communications Standard Dictionary", 2nd Edition, Martin
        H. Weik].
     
        (1995-02-06)