a person who offers views or theories on profound questions in ethics, metaphysics, logic, and other related fields.
a person who is deeply versed in philosophy.
a person who establishes the central ideas of some movement, cult, etc.
a person who regulates his or her life, actions, judgments, utterances, etc., by the light of philosophy or reason.
a person who is rationally or sensibly calm, especially under trying circumstances.
Obsolete. an alchemist or occult scientist.

before 900; Middle English, variant of philosophre < Anglo-French (Middle French philosophe < Latin philosophus); replacing Old English philosoph < Latin philosophus < Greek philósophos philosopher, equivalent to philo- philo- + soph(ía) wisdom (see -sophy) + -os noun suffix

philosophership, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
philosopher (fɪˈlɒsəfə)
1.  a student, teacher, or devotee of philosophy
2.  a person of philosophical temperament, esp one who is patient, wise, and stoical
3.  (formerly) an alchemist or devotee of occult science
4.  a person who establishes the ideology of a cult or movement: the philosopher of the revolution

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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Word Origin & History

O.E. philosophe, from L. philosophus, from Gk. philosophos "philosopher," lit. "lover of wisdom," from philos "loving" + sophos "wise, a sage."
"Pythagoras was the first who called himself philosophos, instead of sophos, 'wise man,' since this latter term was suggestive of immodesty." [Klein]
Modern form with -r appears early 14c., from an Anglo-Fr. or O.Fr. variant of philosophe, with an agent-noun ending. Philosophy also was used of alchemy in Middle Ages, hence Philosophers' stone (late 14c., translating M.L. lapis philosophorum, c.1130), a reputed solid substance supposed by alchemists to change baser metals into gold or silver; also identified with the elixir and thus given the attribute of prolonging life indefinitely and curing wounds and disease. (Fr. pierre philosophale, Ger. der Stein der Weisen).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

philosopher definition

Someone who engages in philosophy. Some examples of philosophers are Aristotle, Immanuel Kant, and Plato.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Earlier philosophers pondered the plurality of worlds with less dire
Bards are at once entertainers, philosophers, and historians.
Many ancient philosophers believed that human consciousness resided in the
The philosophers have been taking their own temperatures.
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