| A | B |
| chivalry | Code of Knights |
| fief | an estate with peasants included |
| serf | a peasant laborer legally bound to the land |
| secular clergy | clergy who lived among society |
| regular clergy | clergy who lived in seclusion |
| excommunication | exclussion from the church |
| vassal | a noble who held land from and served a higher-ranking lord |
| simony | selling of church postions |
| homage | pledge of loyalty between vassal and lord |
| heresy | denial of basic church teachings |