lustrum

名词 lustrum:

1. a period of five years
2. a ceremonial purification of the Roman population every five years following the census

lus.trum

n.（名词）
【复数】 lus.trums 或 lus.tra [-tr…]
A ceremonial purification of the entire ancient Roman population after the census every five years.
驱邪仪式：古罗马每五年普查人口后对全体国民进行的净化仪式
A period of five years.
五年之期

来源：
Latin lôstrum * see luster
拉丁语 lôstrum *参见 luster