Source : WordNet®

broadband
     adj 1: of or relating to or being a communications network in which
            the bandwidth can be divided and shared by multiple
            simultaneous signals (as for voice or data or video)
     2: responding to or operating at a wide band of frequencies; "a
        broadband antenna" [syn: {wideband}]

Source : Free On-Line Dictionary of Computing

broadband
     
         A transmission medium capable of supporting a
        wide range of frequencies, typically from audio up to video
        frequencies.  It can carry multiple signals by dividing the
        total capacity of the medium into multiple, independent
        bandwidth channels, where each channel operates only on a
        specific range of frequencies.
     
        See also {baseband}.
     
        (1995-05-09)