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lustrum

play
noun lus·trum \ˈləs-trəm\

Definition of lustrum

plural

lustrums

or

lustra

play \-trə\
  1. 1 :  a period of five years

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



Origin and Etymology of lustrum

Latin


First Known Use: 1590


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a very small amount

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