In Roman law. In the course of an actual trial; before a judge, (judex.) A cause, during its preparatory stages, conducted before the praetor, was said to be in jure; in its second stage, after it had been sent to a judex for trial, it was said to be in judicio. In judicio non creditor nisi juratis. Cro. Car. 64. In a trial, credence is given only to those who are sworn.