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• Feudalism: A term coined by historian to describe the type of government institutions, as well as the general social and political relationships, the existed among the warrior-landholders in much of Europe during the middle ages
• Feudal Compact: An arrangement between a lord and his vassal involving the exchange of property for personal service
• Fief: A grant of land and accompanying government responsibilities and power
• Vassal: A name for the relationship between the lord, and the knight
• Knight: A mounted soldier serving under a feudal superior in the Middle Ages
• Homage: A vassal's act of promising loyalty and obedience to his lord
• Serf: The lowest class of a peasant, who is bound to the land, it is a lifelong status & you can't work your way out of being a serf
• Baron: A great lord who exercised government authority over vast family territory 
• Peasantry: The status or character of a peasant 
• Estates: In the Middle Ages, the groups that made up society: often defined as those who pray, those who fight, and those who work
• Manor: The principal farming property and social unit of a medieval community, usually belonging to a member of the feudal nobility or to a church institution 
• Three-field-system: A method of crop rotation designed to maintain the fertility of the soil and to provide for a regular supply of fall and spring crops
• Internal colonization: The process of cultivating and settling in formerly wild land in medieval Europe
• Suburb: The are composed of much districts
• Guild: An organization of merchants or craftspeople who regulated the activities of their members and set standards and prices
• Master: A craftsman who had the right to operate workshops, train others, and vote on guild businesses 
• Journeyman: A licensed artisan who had served an apprenticeship and who was employed by a master and paid at a fixed rate per day
• Apprentice: A "learner" in the shop of a master
• Water mill: A mill operated by a water wheel
• Iron plow: