expert
US /ˈek.spɝːt/
UK /ˈek.spɝːt/
1.
a person who has a comprehensive and authoritative knowledge of or skill in a particular area.
:
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She is an expert in ancient history.
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He consulted a legal expert.
1.
having or involving comprehensive and authoritative knowledge or skill in a particular area.
:
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He gave an expert opinion on the matter.
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She has an expert eye for detail.