The Collaborative International Dictionary of English v.0.48:

LAN \LAN\ n. [Local Area Network.]
   A local area network; a network[3] connecting computers and
   word processors and other electronic office equipment within
   a small area, to create an inter-office system, typically
   within one building or one site of a corporation. Contrasted
   to WAN, a wide-area network.

   Syn: local area network.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

local area network
    n 1: a local computer network for communication between
         computers; especially a network connecting computers and
         word processors and other electronic office equipment to
         create a communication system between offices [syn: local
         area network, LAN]

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

local area network
LAN

    (LAN) A data communications network which is
   geographically limited (typically to a 1 km radius) allowing
   easy interconnection of terminals, microprocessors and
   computers within adjacent buildings.  Ethernet and FDDI
   are examples of standard LANs.

   Because the network is known to cover only a small area,
   optimisations can be made in the network signal protocols that
   permit data rates up to 100Mb/s.

   See also token ring, wide area network, metropolitan area
   network..

   Usenet newsgroup: news:comp.dcom.lans.misc.

   (1995-03-13)