[luhs-truh m] /ˈlʌs trəm/

noun, plural lustrums, lustra
[luhs-truh] /ˈlʌs trə/ (Show IPA)
Also, luster; especially British, lustre. a period of five years.
Roman History. a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.
noun (pl) -trums, -tra (-trə)
a period of five years

(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.”


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