a statement or proposition that seems self-contradictory or absurd but in reality expresses a possible truth.
a self-contradictory and false proposition.
any person, thing, or situation exhibiting an apparently contradictory nature.
an opinion or statement contrary to commonly accepted opinion.

1530–40; < Latin paradoxum < Greek parádoxon, noun use of neuter of parádoxos unbelievable, literally, beyond belief. See para-1, orthodox

paradoxical, paradoxal, adjective
paradoxology, noun

3. puzzle, anomaly, riddle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
paradox (ˈpærəˌdɒks)
1.  a seemingly absurd or self-contradictory statement that is or may be true: religious truths are often expressed in paradox
2.  a self-contradictory proposition, such as I always tell lies
3.  a person or thing exhibiting apparently contradictory characteristics
4.  an opinion that conflicts with common belief
[C16: from Late Latin paradoxum, from Greek paradoxos opposed to existing notions, from para-1 + doxa opinion]

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

1540, from L. paradoxum "paradox, statement seemingly absurd yet really true," from Gk. paradoxon, from neut. of adj. paradoxos "contrary to expectation, incredible," from para- "contrary to" + doxa "opinion."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

paradox par·a·dox (pār'ə-dŏks')
That which is apparently, though not actually, inconsistent with or opposed to the known facts in any case.

par'a·dox'i·cal adj.
par'a·dox'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

paradox definition

A statement that seems contradictory or absurd but is actually valid or true. According to one proverbial paradox, we must sometimes be cruel in order to be kind. Another form of paradox is a statement that truly is contradictory and yet follows logically from other statements that do not seem open to objection. If someone says, “I am lying,” for example, and we assume that his statement is true, it must be false. The paradox is that the statement “I am lying” is false if it is true.

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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Computing Dictionary

Paradox definition

A relational database for Microsoft Windows, originally from Borland.
Paradox 5 ran on Microsoft Windows [version?] and provided a graphical environment, a debugger, a data modelling tool, and many "ObjectPAL" commands.
Paradox 7 ran under Windows 95 and Windows NT.
Latest version: Paradox 9, as of 2000-02-10 (a Corel product).

paradox definition

An apparently sound argument leading to a contradiction.
Some famous examples are Russell's paradox and the liar paradox. Most paradoxes stem from some kind of self-reference.
Smarandache Linguistic Paradox (
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Halpern is attuned to the paradox of treating memory, a basic aspect of the
  self, as a biological puzzle.
Beirut is a city that is alternately triumphant and tragic, where paradox has
  been raised to an art form.
The book is an admirable attempt to pierce the paradox of a people steeped in
  sense of place, yet ever on the move.
This, in the view of the physicist, is a perfect example of the time paradox at
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