WordNet (r) 3.0 (2006):

National Science Foundation
    n 1: an independent agency of the federal government responsible
         for the promotion of progress in science and engineering by
         supporting programs in research and education [syn:
         National Science Foundation, NSF]

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

National Science Foundation
NSF

    (NSF) A US government agency that promotes the
   advancement of science by funding science researchers,
   scientific projects and infrastructure to improve the quality
   of scientific research.  The NSFNET is funded by NSF.

   (http://nsf.org/).

   (1999-01-15)