Dictionary.net

In Roman law. A species of equitable title to things, as distinguished from a title acquired according to the strict forms of the municipal law; the property of a Roman citizen in a subject capable of quiritary property, acquired by a title not known to the civil law, but introduced by the prretor, and protected by his impcrium or supreme executive power, e. g., where res mancipi had been transferred by mere tradition. Poste's Gaius Inst 187. See QUIRITARIAN OWNERSHIP.