Meaning of “expert” in the English Dictionary

"expert" in British English

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expertnoun [ C ]

uk /ˈek.spɜːt/ us /ˈek.spɝːt/

B1 a person with a high level of knowledge or skill relating to a particular subject or activity:

My mother is an expert at dress-making (= she does it very well).

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expertadjective [ before noun ]

uk /ˈek.spɜːt/ us /ˈek.spɝːt/

B2 having or showing a lot of knowledge or skill:

What's your expert opinion?
an expert fisherman

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expertly
adverb uk /ˈek.spɜːt.li/ us /ˈek.spɝːt.li/

He carved the meat expertly.

(Definition of “expert” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"expert" in American English

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expertnoun [ C ]

us /ˈek·spɜrt/

a person having a high level of knowledge or skill in a particular subject:

He is the administration’s foreign-policy expert for eastern Europe.
expert
adjective [ not gradable ] us /ˈek·spɜrt, ɪkˈspɜrt/

She’s an expert swimmer.
expertly
adverb [ not gradable ] us /ˈek·spɜrt·li, ɪkˈspɜrt·li/

(Definition of “expert” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"expert" in Business English

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expertnoun [ C ]

uk /ˈekspɜːt/ us

a person with a high level of knowledge or skill:

an expert on sth The professor is an expert on the rights of tax-exempt organizations.
an expert at sth We need someone who is an expert at display design.
an expert in sth He is a leading expert in the field of waste management.

expertadjective

uk /ˈekspɜːt/ us

having or showing a lot of knowledge or skill:

expert advice/opinion We need expert advice, and that's why we've called you in.
He had expert knowledge of commercial lending.
be expert at doing sth Librarians are expert at finding information for you.
expertly
adverb

He chaired the meeting expertly.

(Definition of “expert” from the Cambridge Business English Dictionary © Cambridge University Press)