This definition appears somewhat frequently
See other definitions of WAN
Samples in periodicals archive:
The Metropolitan Area Network is designed to connect networks in a metropolitan area, city, campus, community, etc. It is wider than the Local Area Network which can only be used in one building, floor or wide room. But, it is not as big as the Wide Area Network which goes beyond one area or city to another location. The coverage of Metropolitan area network in terms of geography is between LAN and WAN.