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| lus·trum [ lústrəm ] (plural lus·trums or lus·tra [ lústrə ]) |
noun |
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| Definition: |
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1. five-year period: a period of five years
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2. Roman purification: purification of the entire ancient Roman people, which took place every five years after the census
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| [Late 16th century. < Latin, "purification"] |
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