a person who has special skill or knowledge in some particular field; specialist; authority

a language expert.

Military .

the highest rating in rifle marksmanship, above that of marksman and sharpshooter.

a person who has achieved such a rating.

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.

to act as an expert for.

adjective

amateur , inexpert , unknowledgeable , unskilled , untrained , seeinexpert

noun

amateur , apprentice , ignoramus , novice , bungler , tyro

adjective

able , adept , adroit , apt , big league * , clever , crack , crackerjack * , deft , dexterous , experienced , facile , handy , practiced , professional , qualified , savvy , schooled , sharp , skilled , skillful , slick , trained , virtuoso , master , masterful , masterly , proficient , an fait , au fait , esthetic , versatile , virtuosic

noun

ace * , adept , artist , artiste , authority , buff , connoisseur , doyen , graduate , guru * , hot shot , old hand * , old pro , phenomenon , pro , professional , proficient , shark * , virtuoso , whiz * , wizard , ace , dab hand , master , past master , adroit , brain trust , capable , cognoscente , consultant , dabster , deft , deftness , doyenne , esthete , experienced , expertise , expertness , gourmet , maestro , masterhand , maven , oner , past mistress , pundit , schooled , skill , skilled , specialist , virtuosity