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Lustrum  A Roman Census Years Lus·Trum Noun Plural

Title lustrum
Text
Merriam-Webster's Collegiate Dictionary
lus·trum

 \\ˈləs-trəm\\ noun 
(plural lustrums or lus·tra 
 \\-trə\\)
 ETYMOLOGY  Latin
 DATE  1590
1. a period of five years
2.
  a. a purification of the whole Roman people made in ancient times after the census every five years
  b. the Roman census
English Etymology
lustrum
  pl. lustra, 1580s, from L. lustrum, perhaps from root of luere "to wash," related to lavere (see lave).
Webster's Third New International Dictionary, Unabridged
lus·trum
\ˈləstrəm\ noun
(plural lus·trums \-trəmz\ ; or lus·tra \-trə\)
Etymology: Latin; akin to Latin lucēre to shine — more at 
light
1. 
 a. : a purification of the whole Roman people made in ancient times after the census which was taken every five years
 b. : the Roman census
2. : a period of five years : 
quinquennium
 < from 1797-1802 they shared a lustrum of sympathy and love — George Mallaby >

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