This article is about people called professionals. For the movie, see The Professional or Leon. For the TV series, see The Professionals. A professional can be either a person in a profession (certain types of skilled work requiring formal training/education) or in sports (a sportsman/sportwoman doing sports for payment).[LINK: http://www.faststart.state.ri.us/bfs_glossary.html] Glossary (from the Business Fast Start project of Rhode Island authorities)[LINK: http://wordnet.princeton.edu/perl/webwn?s=professional] Professional (definition via the WordNet, Princeton University) Sometimes it is also used to indicate a special level of quality of goods or tools, sometimes also called "commercial grade".[LINK: http://www.watertips.com/tutorial/prograde.htm] "What are Professional Grade Parts?" (example from the watertips.com w

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