The Collaborative International Dictionary of English v.0.48:

Nas \Nas\ [Contr. fr. ne has.]
   Has not. [Obs.] --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nas \Nas\ (n[aum]z). [For ne was.]
   Was not. [Obs.] --Chaucer.
   [1913 Webster]

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

NAS
       Netware Access Services (Novell, Netware)


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

NAS
       Network Application Support


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

NAS
       Network Application Services (DEC)


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

NAS
       Network Attached Storage (NFS, CIFS, HDD)


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

NAS

    1. Network Application Support.

   2.  Network Attached Storage.

   3.  National Advanced Systems.

   (2003-07-20)