expert Definition

expert
noun

1. Someone with great skill in, or extensive knowledge of, a particular subject.

Thesaurus: professional, master, ace, virtuoso, authority, wizard.

adj

1. Highly skilled or extremely knowledgeable.

Thesaurus: skilled, trained, professional, experienced, practiced, facile, adept, adroit, masterly, proficient.
2. Relating to or done by an expert or experts.

Derivative: expertly
adverb

Etymology: 14c as adj; 19c as noun: from Latin expertus, from experiri to try.