expert

adj. skilled, knowledgeable

n. person skilled in a particular area, specialist

An expert is someone widely recognized as a reliable source of or skill whose faculty for judging or deciding rightly, justly, or wisely is accorded authority and status by their peers or the public. An expert, more generally, is a person with extensive knowledge or ability in a particular area of study. Experts are called in for advice on their respective subject, but they do not always agree on the particulars of a field of study. An expert can be, by virtue of training, education, profession, publication or experience, believed to have special knowledge of a subject beyond that of the average person, sufficient that others may officially (and legally) rely upon the individual's opinion. Historically, an expert was referred to as a sage. The individual was usually a profound philosopher distinguished for wisdom and sound judgment.
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Noun
1. a person with special knowledge or ability who performs skillfully
(hypernym) person, individual, someone, somebody, mortal, human, soul
(hyponym) ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz
Adjective
1. having or showing knowledge and skill and aptitude; "adept in handicrafts"; "an adept juggler"; "an expert job"; "a good mechanic"; "a practiced marksman"; "a proficient engineer"; "a lesser-known but no less skillful composer"; "the effect was achieved by skillful retouching"
(synonym) adept, good, practiced, proficient, skillful, skilful
(similar) skilled

adj. expert; adept, masterful

n. expert, valuator; specialist, authority, adept; appraiser, assessor; observer

n. expert, specialist