V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

NSFNET
       National Science Foundation NETwork (network, USA, Internet),
"NSFnet"


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

National Science Foundation Network
NSFNET

   (NSFNET) A high speed hierarchical "network of networks" in
   the US, funded by the National Science Foundation.  At the
   highest level, it is a backbone network comprising 16 nodes
   connected to a 45Mb/s facility which spans the continental
   United States.  Attached to that are mid-level networks and
   attached to the mid-levels are campus and local networks.
   NSFNET also has connections out of the US to Canada, Mexico,
   Europe, and the Pacific Rim.  The NSFNET is part of the
   Internet.

   (1993-01-01)