lustrum

英 ['lʌstrəm] 美
  • n. 五年时间；人口普查
lustrum
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英文词源

lustrum (n.)
(plural lustra), "purification of the Roman people every five years," 1580s, from Latin lustrum, perhaps from root of luere "to wash," related to lavere (see lave). Or [Watkins, Klein] from PIE *leuk-stro-, from base *leuk- "light, brightness."