Definition of Feudalism

The feudal system; the aggregate of feudal principles and usages. The social, political, and economic system that dominated the major European nations between the ninth and fifteenth centuries. The system was based upon a servile relationship between a "vassal” and a "lord.” The vassal paid homage and service to the lord and the lord provided land and protection to the vassal. See also Feudal system.

That's the definition of Feudalism in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.