lustrum

noun
lus·trum | \ˈlə-strəm \
plural lustrums or lustra\ˈlə-strə \

Definition of lustrum 

1 : a period of five years

2a : a purification of the whole Roman people made in ancient times after the census every five years

b : the Roman census

First Known Use of lustrum

1590, in the meaning defined at sense 1

History and Etymology for lustrum

Latin

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Dictionary Entries near lustrum

lustrical

lustring

lustrous

lustrum

lusty

lusus

lusus naturae

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The first known use of lustrum was in 1590

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