The Collaborative International Dictionary of English v.0.48:

Es \Es\ n.
   the chemical symbol for einsteinium, a transuranic element
   with atomic number 99. The atomic weight of the longest-lived
   isotope, with a half-life of 276 days, is 254. The first
   isotope discovered, having atomic weight 253 and a half-life
   of 20 days, was recognized in 1952 in the debris from a
   hydrogen bomb test. As much as 3 micrograms of einsteinium
   were produced by a complex process involving long irradiation
   of plutonium isotopes in nuclear reactors. Its chemical
   properties are those of a trivalent actinide element. --HCP61

   Syn: einsteinium, atomic number 99.
        [WordNet 1.5 +PJC]

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

ES
       [Red Hat Enterprise Linux] Enterprise Server (RedHat, Linux,
RHEL)


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

ES
       Embedded Systems


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

ES
       End System (ATM)


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

ES
       European Standard (ETSI)


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

ES
       Errored Seconds (DS1/E1)


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

ES
       Extended Services (OS/2)


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

ES
       Extra Segment [register] (CPU, Intel, assembler)