The flashcard defines 'lustrum' as a noun meaning 'a Roman purification ceremony performed every five years'.
lustrum 是一个名词，意思是“（古罗马每五年人口普查后的）驱邪仪式”。
| Front | lustrum [lustr;-um n.] |
|---|---|
| Back | n.（古罗马每五年人口普查后的）驱邪仪式 |
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