Definition of Exceptio Jurisjurandi
An exception of oath; an exception or plea that the matter had been sworn to. This kind of exception was allowed where a debtor, at the instance of his creditor (creditors deferente), had sworn that nothing was due the latter, and had notwithstanding been sued by him.
That's the definition of Exceptio Jurisjurandi in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.