Ph.D

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Doctor of Philosophy

noun
1.
Also called doctorate. the highest degree awarded by a graduate school, usually to a person who has completed at least three years of graduate study and a dissertation approved by a board of professors.
2.
a person who has been awarded this degree. Abbreviation: Ph.D.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
Doctor of Philosophy
 
n
PhD, Abbreviation: DPhil a doctorate awarded for original research in any subject except law, medicine, or theology

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

Ph.D
attested from 1869.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

Ph.D. abbr.
Latin Philosophiae Doctor (Doctor of Philosophy)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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