The economic, political, and social system that characterized much of medieval Europe, in which land was held by vassals from lords in exchange for military or other service and allegiance.
Under feudalism, a knight might receive a parcel of land from his lord in return for promising to fight in the lord's army.
Any comparable hierarchical system of land tenure and mutual obligations found in societies outside medieval Europe, such as in medieval Japan.
Historians often describe the social order of the Kamakura shogunate as a form of Japanese feudalism.