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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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Examples for lustrum
  • Neither a century nor a lustrum is typically graced with any special moniker.
British Dictionary definitions for lustrum

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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for lustrum
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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9
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