Etymology
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cyberspace (n.)

"the online world of computer networks and especially the Internet, the environment in which communication over computer networks occurs," 1982, often written as two words at first, coined by science fiction writer William Gibson (best known for "Neuromancer") and used by him in a short story published in 1982, from cyber- + space (n.).

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Definitions of cyberspace

cyberspace (n.)
a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange;
Synonyms: internet / net
From wordnet.princeton.edu