Professional
Professional , adjective
1.
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.
Pride, not personal, but professional.
A professional sneerer.
2.
Engaged in by professionals; as, a professional race; -- opposed to amateur.
Professional , noun
A person who prosecutes anything professionally, or for a livelihood, and not in the character of an amateur; a professional worker.