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lustrum

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noun lus·trum \ˈlə-strəm\

Definition of lustrum

plural

lustrums

or

lustra

play \ˈlə-strə\

  1. 1 :  a period of five years

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

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Origin and Etymology of lustrum

Latin

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