lustrum

• 名词，指五年的时间段；在古罗马历史中也指每五年一次、在人口普查后举行的净化仪式。

A noun referring to a period of five years, or historically, a ceremonial purification of the Roman population conducted every five years after the census.

1. C2formal

   A period of five years, often used in historical or formal contexts.

   五年期

   • The project spanned a lustrum before completion.
   • He served as chairman for a full lustrum.
   • The census is conducted every lustrum in some countries.

   同义词quinquennium

2. Roman purification ceremonyC2formalbritish

   In ancient Rome, a ceremonial purification of the entire population performed every five years after the census.

   五年净化祭

   • The lustrum was a major religious event in ancient Rome.
   • After the census, the censor performed the lustrum.
   • The ritual of the lustrum involved sacrifices and prayers.