ENS

from The Collaborative International Dictionary of English v.0.48

Ens \Ens\ ([e^]nz), n. [L., ens, entis, a thing. See {Entity}.]
   1. (Metaph.) Entity, being, or existence; an actually
      existing being; also, God, as the Being of Beings.
      [1913 Webster]

   2. (Chem.) Something supposed to condense within itself all
      the virtues and qualities of a substance from which it is
      extracted; essence. [Obs.]
      [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

ENS

   <body> See {Ecole Normale Superieure}

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

ENS
       Enterprise Network Services (Banyan, VINES)