(a) a notional world controlled by machines or computers (rare); (b) = cyberworld n.

Science Fiction. Also Matrix. With the: = cyberspace, n.

The space of virtual reality; the notional environment within which electronic communication (esp. via the internet) occurs. Cf. Cyberia, n.

= cyberspace, n.; (also) a computer-generated environment, a virtual reality.

Science Fiction and Computing. A computer-generated environment within which users can interact with one another and their surroundings, a virtual…

Frequently with capital initial. The notional environment for communication, entertainment, etc., provided by the World Wide Web; all websites…