Lustrum
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Lustrum was a sacrifice for expiation and purification offered by one of the censors of Rome in name of the Roman people at the close of the taking of the census, and which took place after a period of five years, so that the name came to denote a period of that length. The usage of the word lustrum to mean 5 years is now obselete.
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This article incorporates text from the public domain 1907 edition of The Nuttall Encyclopaedia.