Definitions of professional:

• noun:   a person engaged in one of the learned professions
• noun:   an athlete who plays for pay
• noun:   an authority qualified to teach apprentices
• adjective:   engaged in a profession or engaging in as a profession or means of livelihood

  Example: "The professional man or woman possesses distinctive qualifications"

• adjective:   characteristic of or befitting a profession or one engaged in a profession

  Example: "Professional conduct"

• adjective:   engaged in by members of a profession

  Example: "Professional occupations include medicine and the law and teaching"

• adjective:   of or relating to a profession

  Example: "We need professional advice"

• adjective:   of or relating to or suitable as a profession

  Example: "Professional organizations"