Professional

Of or pertaining to a profession, or calling; conforming to the rules or standards of a profession; following a profession; as, professional knowledge; professional conduct.

Engaged in by professionals; as, a professional race; -- opposed to amateur.

A person who prosecutes anything professionally, or for a livelihood, and not in the character of an amateur; a professional worker.

engaged in a profession or engaging in as a profession or means of livelihood; "the professional man or woman possesses distinctive qualifications"; "began her professional career after the Olympics"; "professional theater"; "professional football"; "a professional cook"; "professional actors and athletes"