Taught by use, practice, or experience, experienced; having
facility of operation or performance from practice; knowing and ready
from much practice; clever; skillful; as, an expert surgeon; expert in
chess or archery.
An expert or experienced person; one instructed by
experience; one who has skill, experience, or extensive knowledge in
his calling or in any special branch of learning.
A specialist in a particular profession or department of
science requiring for its mastery peculiar culture and erudition.