The Free On-line Dictionary of Computing (30 December 2018):

Metropolitan Area Network
MAN

   (MAN) A data network intended to serve an area the size of a
   large city.  Such networks are being implemented by innovative
   techniques, such as running optical fibre through subway
   tunnels.  A popular example of a MAN is SMDS.

   See also Local Area Network, Wide Area Network.

   (1994-11-22)