What is Bonitarian Ownership?

Legal Definition
In Roman law. A species of equitable title to things, ajs 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 praetor, and protected by his imperium or supreme executive power, e. g., where res mancipi had been transferred by mere tradition. Poste's Gaius Inst 187. See Quiritarian Ownership.
-- Black's Law Dictionary