From WordNet (r) 3.0 (2006) :
workstation
n 1: a desktop digital computer that is conventionally
considered to be more powerful than a microcomputer
From 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)