15 Pa. C.S. § 9303
The following words and phrases when used in this chapter shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Associates." The members of any association.
"Profession." Includes all occupations legally or traditionally designated as professions in which members by law (apart from Chapter 29 (relating to professional corporations) ), tradition or ethics are forbidden to incorporate for the purpose of rendering professional services, including, but not limited to, architects, attorneys at law, certified public accountants, chiropractors, dentists, osteopaths, physicians and surgeons.
"Professional service." Any type of service which can be rendered by the member of any profession within the purview of that profession.
15 Pa.C.S. § 9303