lustrum

noun
lus·​trum | \ ˈlə-strəm How to pronounce lustrum (audio) \
plural lustrums or lustra\ ˈlə-​strə How to pronounce lustra (audio) \

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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The first known use of lustrum was in 1590

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Cite this Entry

“Lustrum.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/lustrum. Accessed 6 December 2019.

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