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WordNet (r) 3.0 (2006) (WordNet)

professional
adj 1: 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" [ant:
{nonprofessional}]
2: of or relating to or suitable as a profession; "professional
organizations"; "a professional field such as law"
3: characteristic of or befitting a profession or one engaged in
a profession; "professional conduct"; "professional ethics";
"a thoroughly professional performance" [ant:
{unprofessional}]
4: of or relating to a profession; "we need professional
advice"; "professional training"; "professional equipment for
his new office"
5: engaged in by members of a profession; "professional
occupations include medicine and the law and teaching"
n 1: a person engaged in one of the learned professions [synonym:
{professional}, {professional person}]
2: an athlete who plays for pay [synonym: {professional}, {pro}]
[ant: {amateur}]
3: an authority qualified to teach apprentices [synonym: {master},
{professional}]