expert
noun [ C ]
uk/ˈekspɜːt/ usa 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.
a marketing/security/computer expert
medical/legal/financial experts
a world/industry/international expert
a top/leading/acknowledged expert
expert
adjective
uk/ˈekspɜːt/ ushaving 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.