Par`a*dox (?), n.; pl. Paradoxes (#). [F. paradoxe, L. paradoxum, fr. Gr. &?;; para` 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.

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

• An apparently true statement that seems to lead to a contradiction or to circumstances that defy intuition.
       Moving an article from Wikipedia to Wiktionary could increase the average article length on both wikis; that's a paradox.
  
• (logic) A self-contradictory statement.
       "This sentence is false" is a paradox.
  
• (mathematics) a conclusion based on undefined functions
       Example: (2 x 0) = (3 x 0) therefore (dividing both sides by zero) 2 = 3-->