Source : WordNet®

wide area network
     n : a computer network that spans a wider area than does a local
         area network [syn: {WAN}]

Source : Free On-Line Dictionary of Computing

Wide Area Network
     
        (WAN) A {network}, usually constructed with {serial line}s,
        extending over distances greater than one kilometre.
     
        Compare {local area network}, {metropolitan area network}.
     
        (1994-11-24)