lustrum
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.lus·trum
noun \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
Origin of LUSTRUM
Latin
First Known Use: 1590
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