First Known Use: 1590
Dictionary
lustrum
noun lus·trum \ˈləs-trəm\
plural lustrums or lus·tra \-trə\
Definition of LUSTRUM
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
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Origin of LUSTRUM
Latin
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