lustra

lustrum

[luhs-truhm]
noun, plural lustrums, lustra [luhs-truh] .
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:
1580–90; < Latin lūstrum; cf. luster1

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World English Dictionary
lustrum or lustre (ˈlʌstrəm)
 
n , pl -trums, -tra
a period of five years
 
[C16: from Latin: ceremony of purification, from lustrāre to brighten, purify]
 
lustre or lustre (ˈlʌstrəm, -trə)
 
n
 
[C16: from Latin: ceremony of purification, from lustrāre to brighten, purify]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

lustrum
pl. lustra, 1580s, from L. lustrum, perhaps from root of luere "to wash," related to lavere (see lave).
Online Etymology Dictionary, © 2010 Douglas Harper
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