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lustrum

[luhs-truh m] /ˈlʌs trəm/
noun, plural lustrums, lustra
[luhs-truh] /ˈlʌs trə/ (Show IPA)
1.
Also, luster; especially British, lustre. a period of five years.
2.
Roman History. a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.
Origin
1580-1590
1580-90; < Latin lūstrum; cf. luster1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lustra

lustrum

/ˈlʌstrəm/
noun (pl) -trums, -tra (-trə)
1.
a period of five years
Word Origin
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
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Word Origin and History for lustra

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."

Online Etymology Dictionary, © 2010 Douglas Harper
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