Source : Webster's Revised Unabridged Dictionary (1913)

Paradox \Par`a*dox\, n.; pl. {Paradoxes}. [F. paradoxe, L.
   paradoxum, fr. Gr. ?; ? beside, beyond, contrary to + ? to
   think, suppose, imagine. See {Para-}, and {Dogma}.]
   A tenet or proposition contrary to received opinion; an
   assertion or sentiment seemingly contradictory, or opposed to
   common sense; that which in appearance or terms is absurd,
   but yet may be true in fact.

         A gloss there is to color that paradox, and make it
         appear in show not to be altogether unreasonable.
                                                  --Hooker.

         This was sometime a paradox, but now the time gives it
         proof.                                   --Shak.

   {Hydrostatic paradox}. See under {Hydrostatic}.

Source : WordNet®

paradox
     n : (logic) a self-contradiction; "`I always lie' is a paradox
         because if it is true it must be false"

Source : Free On-Line Dictionary of Computing

Paradox
     
         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).
     
        {Home (http://www.corel.com/paradox9/index.htm)}.
     
        [Update?]
     
        (1996-05-27)

paradox
     
         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
        (http://www.gallup.unm.edu/~smarandache/Paradox.htm)}.
     
        (1999-11-05)