Lat In Roman law. An expert in juridical science; a person thoroughly versed in the laws, who was habitually resorted to, for information and advice, both by private persons as his clients, and also by the magistrates, advocates, and others employed in administering justice. Jurisdictio est potestas de publico in- troducta, cum necessitate juris dicendi. Jurisdiction is a po>ver introduced for the public good, ou account of the necessity of dispensing justice. 10 Coke, 73a.