professional

adj. 1 of, belonging to, or connected with a profession. 2 a skilful, competent. B worthy of a professional (professional conduct). 3 engaged in a specified activity as one's main paid occupation (professional boxer). 4 derog. Engaged in a specified activity, esp. Fanatically (professional agitator). n. Professional person.  professionally adv.

a. 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.