IN PROPRIA TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.Latin meaning in one’s own defence. Serving as one’s own attorney. Related Posts:PROPRIA PERSONAET CETERANEMO DEBET ESSE JUDEX IN PROPRIA CAUSANULLUS COMMODUM CAPERE POTEST EX SUA INJURIA PROPRIAIN CURIA DOMINI REGIS IPSE IN PROPRIA PERSONA JURA DISCERNITHALF DEFENCE