OPTIMA LEGUM INTERPRES EST CONSUETUDO TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.Latin, meaning The best interpreter of laws is custom. Related Posts:OPTIMACYCONSUETUDOOPTIMUS INTERPRES RERUM EST USUSCONSUETUDO LOCI OBSERVANDA ESTPRAXISCONTEMPORANEA EXPOSITIO EST OPTIMA ET FORTISSIMA IN LEGE