cyber-

a combining form meaning “computer,” “computer network,” or “virtual reality,” used in the formation of compound words (cybertalk; cyberart; cyberspace ) and by extension meaning “very modern” (cyberfashion ).

Origin:
extracted from cybernetics

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
cyber-
 
combining form
indicating computers: cyberphobia
 
[C20: back formation from cybernetics]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

cyber
as a prefix, ultimately from cybernetics (q.v.). It enjoyed explosive use with the rise of the Internet early 1990s. One researcher (Nagel) counted 104 words formed from it by 1994. Cyberpunk (by 1986) and cyberspace were among the earliest.
Cyber is such a perfect prefix. Because nobody has any idea what it means, it can be grafted onto any old word to make it seem new, cool -- and therefore strange, spooky. ["New York" magazine, Dec. 23, 1996]
As a stand-alone, it is attested by 1998 as short for cybersex (which is attested by 1995).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cyber-  
A prefix that means "computer" or "computer network," as in cyberspace, the electronic medium in which online communication takes place.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

cyber definition

chat
To have cybersex.
(1997-06-21)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
cyber
  1. cybernetic

  2. cybernetics

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
But theirs is the cyber equivalent of non-violent action or civil disobedience.
In fact, around our cyber- household it already does.
And increasingly, power will be exercised in the diffuse domain of cyber
  interactions.
Develops a strategy for the security of a highly digitized nation in the face
  of potential cyber- and other aggression.
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