Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: Latin expertus, past participle of experiri; EXPERIENCE1

expert

2 adjective
     
expert2 W3
1 having a special skill or special knowledge of a subject [≠ inexpert]
expert on/in/at
The police are expert at handling situations like this in strict confidence.
He cast his expert eye on the gardener's work.
2 relating to or coming from an expert:
Ministers depend on civil servants for expert advice.
—expertly adverb
—expertness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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