WordNet (r) 3.0 (2006):

ANS
    n 1: the part of the nervous system of vertebrates that controls
         involuntary actions of the smooth muscles and heart and
         glands [syn: autonomic nervous system, ANS]

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

ANS
       Advanced Network & Services Inc. (IBM, MCI. Merit, NFSnet)


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

ANS
       American National Standard (ANSI, ISO, USA)


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

American National Standard
ANS

    (ANS) A common prefix for ANSI documents or
   standards, e.g.: "ANS Forth", or "American National Standard
   X3.215-1994".

   (1998-07-01)