lustrum


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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