expert (
http://definr.com/expert)
adj 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" [syn:
adept,
good,
practiced,
proficient,
skillful,
skilful]
2: having or showing great skill or knowledge or special
training as expected of a professional; "an expert
opinion"
n : a person with special knowledge or ability who performs
skillfully