[ luhs-truhm ]
/ ˈlʌs trəm /
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See synonyms for: lustrum / lustra / lustrums on Thesaurus.com

noun, plural lus·trums, lus·tra [luhs-truh]. /ˈlʌs trə/.

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.



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Origin of lustrum

First recorded in 1580–90; from Latin lūstrum; cf. luster1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for lustrum



/ (ˈlʌstrəm) /

noun plural -trums or -tra (-trə)

a period of five years

Word Origin for lustrum

C16: from Latin: ceremony of purification, from lustrāre to brighten, purify
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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