WordNet (r) 3.0 (2006):

workstation
    n 1: a desktop digital computer that is conventionally
         considered to be more powerful than a microcomputer

The Free On-line Dictionary of Computing (30 December 2018):

workstation

    A general-purpose computer designed to be used by
   one person at a time and which offers higher performance than
   normally found in a personal computer, especially with
   respect to graphics, processing power and the ability to carry
   out several tasks at the same time.

   (1995-05-04)