An organization uniting those who have a common vocation or who are involved with a common field of study.
(=> (Professional-Society ?Self)
(Exists (?A)
(And (Mereological-Member ?Self ?A)
(Physical-Person ?A)
(Exists (?B)
(And (Mereological-Member-Of ?A ?B)
(Professional-Or-Occupational-Group ?B))))))