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[or means teacher in Latin. It has been used continuously as an honored academic title for over a millennium in Europe, where it dates back to the rise of the university. This use spread to the Americas, former European colonies, and is now prevalent in most of the world. As a prefix – “Dr” – its primary designation is a person who has obtained a doctorate — that is, the highest rank of the academic degrees whose completion, in most fields, involves extensive research. See more at Wikipedia.org...]