单词	lustrum
释义	lustrum noun lus·​trum ˈlə-strəm  plural lustrums or lustra ˈlə-strə  1 : a period of five years 2 a : a purification of the whole Roman people made in ancient times after the census every five years b : the Roman census Word History Etymology Latin First Known Use 1590, in the meaning defined at sense 1
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