feu·dal·ism /ˈfjudḷˌɪzəm/
  封建制度
  Feu·dal·ism n.  The feudal system; a system by which the holding of estates in land is made dependent upon an obligation to render military service to the king or feudal superior; feudal principles and usages.
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  feudalism
       n : the social system that developed in Europe in the 8th C;
           vassals were protected by lords who they had to serve in
           war [syn: feudal system]