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Professional Organizations
A professional works to receive payment for an activity (as a profession), which usually requires expertise and carries with it socially significant mores and folkways. That is to say, behaving professionally would indicate that the person's actions remain in accordance with specific rules, written or unwritten, pertaining to behavior, dress, speech, etc. By extension, the adjective professional can indicate that someone has great expertise or skill in a craft or activity.
An organization (U.S. spelling) or organisation (U.K. spelling) is a formal group of people with one or more shared goals.
(From Wikipedia, the free encyclopedia.)