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expert system

noun, Computers.
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.
Origin of expert system
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for expert-system

expert system

a computer program that can offer intelligent advice or make intelligent decisions using rule-based programs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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