a person who has special skill or knowledge in some particular field; specialist; authority: a language expert.
the highest rating in rifle marksmanship, above that of marksman and sharpshooter.
a person who has achieved such a rating.
—adj.
possessing special skill or knowledge; trained by practice; skillful or skilled (often fol. by in or at): an expert driver; to be expert at driving a car.
pertaining to, coming from, or characteristic of an expert: expert work; expert advice.