| A | B |
| crop rotation | the practice of changing the use of fields over time. |
| fallow | unplanted |
| three-field system | system of crop rotation in which a third of the land is planted in a spring crop, a third in a winter crop, a third is fallow |
| bills of exchange | allowed merchants to deposit money in a bank in one city and withdraw it from another bank. |
| guild | a group of workers practicing the same craft, who have joined together to protect their economic interests. |
| mendicant order | founded to fight heresy and to preach to ordinary people |
| mystery plays | plays approved by the church during the Middle Ages because they were based on Bible stories. |
| universities | schools, or groups of schools, that train scholars at the highest levels. |
| natural law | does not change over time or from one society to another. |
| Hundred Years' War | Conflict between France and England that lasted from 1337-1453. |
| bubonic plague | a deadly infection that causes agony and covers the body in buboes |
| Black Death | term for the epidemic of bubonic plague during the Middle Ages |
| Peasants' Revolt | 1381 revolt of English peasants resulting in the death of lords and the burning of manors. |
| scapegoat | people who are blamed for a problem that they did not cause |
| Joan of Arc | young french girl who inspired the French to defeat the British and was burned at the stake by the British for heresy. |