Source : WordNet®

cyberspace
     n : a computer network consisting of a worldwide network of
         computer networks that use the TCP/IP network protocols
         to facilitate data transmission and exchange [syn: {Internet},
          {Net}]

Source : Free On-Line Dictionary of Computing

cyberspace
     
         /si:'ber-spays/ 1. (Coined by {William Gibson})
        Notional "information-space" loaded with visual cues and
        navigable with brain-computer interfaces called "cyberspace
        decks"; a characteristic prop of {cyberpunk} SF.  In 1991
        serious efforts to construct {virtual reality} interfaces
        modelled explicitly on Gibsonian cyberspace were already under
        way, using more conventional devices such as glove sensors and
        binocular TV headsets.  Few hackers are prepared to deny
        outright the possibility of a cyberspace someday evolving out
        of the network (see {network, the}).
     
        2. Occasionally, the metaphoric location of the mind of a
        person in {hack mode}.  Some hackers report experiencing
        strong eidetic imagery when in hack mode; interestingly,
        independent reports from multiple sources suggest that there
        are common features to the experience.  In particular, the
        dominant colours of this subjective "cyberspace" are often
        grey and silver, and the imagery often involves constellations
        of marching dots, elaborate shifting patterns of lines and
        angles, or moire patterns.
     
        [{Jargon File}]
     
        (1999-02-01)