expert

/ˈɛkspəːt/

noun

A person with extensive knowledge or ability in a given subject.
"We called in several experts on the subject, but they couldn't reach an agreement."
A player ranking just below master.

adjective

Extraordinarily capable or knowledgeable.
"I am expert at making a simple situation complex."
Characteristic of an expert.
"This problem requires expert knowledge."

Practice "expert" in context

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