( n. )
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.
( n. )
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.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012