The term CYBER itself is of ancient Greek origin and means something like navigating, steering, for example a moving ship. It is a shortform of Cybernetics, which was the title of a book by the American mathematician Norbert Wiener in 1948, where he describes the "Control and Communication in the Animal and the Machine.
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In the 70ies the term
CYBER has been the brandname of a high-performance computer of the American
Control Data Corporation. From there it spread to science fiction writers
and became a used term among them.