Meaning of expert system

ex'pert sys'tem

Pronunciation: [key]
— Computers. Computers.
  1. a program that gives answers, solutions, or diagnoses, based on available information, by following procedures that attempt to duplicate the thought processes and apply the knowledge of an expert in some particular field.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.