z/OS

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

   <operating system> An {operating system} from {IBM}.
   According to IBM, it is a secure, scalable, high-performance
   enterprise operating system on which to build and deploy
   Internet and {Java}-enabled applications, providing a
   comprehensive and diverse application execution environment.

   (http://ibm.com/servers/eserver/zseries/zos/).

   (2008-01-22)
    
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
ZOS
       Z/Operating System (IBM, Java, OS), "z/OS"
       
    

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