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n. pl. lus·trums or lus·tra (-trə)
1. A ceremonial purification of the entire ancient Roman population after the census every five years.
2. A period of five years.
[Latin lūstrum; see luster.]
n, pl -trums or -tra (-trə)
(Units) a period of five years
[C16: from Latin: ceremony of purification, from lustrāre to brighten, purify]
n., pl. -trums, -tra (-trə).
1. (in ancient Rome) a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.
[1580–90; < Latin lūstrum; compare luster1]
lustrum, luster, lustre
a period of five years.See also: Calendar
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|Noun||1.||lustrum - a period of five years|
|2.||lustrum - a ceremonial purification of the Roman population every five years following the census|
ceremony - the proper or conventional behavior on some solemn occasion; "an inaugural ceremony"
capital of Italy, Eternal City, Italian capital, Rome, Roma - capital and largest city of Italy; on the Tiber; seat of the Roman Catholic Church; formerly the capital of the Roman Republic and the Roman Empire
antiquity - the historic period preceding the Middle Ages in Europe