Cyberspace. A consensual hallucination experienced daily by billions of legitimate operators, in every nation, by children being taught mathematical concepts† A graphical representation of data abstracted from the banks of every computer in the human system. Unthinkable complexity.Lines of light ranged inthenon- space of the mind, clusters and constellations of data. Like city lights, receding.

-Gibson,William Ford
  Neuromancer. This is the first recorded use of the term 'cyberspace'.