Definition of Exceptio rei venditae et tradita
An exception or plea of the sale and delivery of the thing. This exception presumes that there was a valid sale and a proper tradition; but though, in consequence of the rule that no one can transfer to another a greater right than he himself has, no property was transferred, yet because of some particular circumstance the real owner is estopped from contesting it.
That's the definition of Exceptio rei venditae et tradita in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.