Definition of cyberspace noun from the Oxford Advanced Learner's Dictionary

 

cyberspace

 noun
noun
BrE BrE//ˈsaɪbəspeɪs//
 
; NAmE NAmE//ˈsaɪbərspeɪs//
 
[uncountable]
 
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the imaginary place where electronic messages, etc. exist while they are being sent between computers A new electronic link-up that will connect 500 hospitals around the world has checked into cyberspace.
See the Oxford Advanced American Dictionary entry: cyberspace