Lat. In Roman law. A private person appointed by the prtetor, with the consent of the parties, to try and decide a cause or action commenced before him. He received from the praetor a written for-mula instructing him as to.the legal prln-clples recording to which the action was to be judged. Calvin. Hence the proceedings before him were said to be in judicio, as those before the- prsetor were said to be in jure