Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: French
Origin: Old French; EXPERT2

expert

1 noun
     
ex‧pert1 S3 W2 [countable]
someone who has a special skill or special knowledge of a subject, gained as a result of training or experience
expert on/in
He's a world expert on marine mammals.
medical/technical/financial etc expert
Tests should be administered by a medical expert.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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