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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.]


(ˈlʌstrəm) or


n, pl -trums or -tra (-trə)
(Units) a period of five years
[C16: from Latin: ceremony of purification, from lustrāre to brighten, purify]


(ˈlʌs trəm)

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.
2. Also, luster ;esp. Brit., lustre. a period of five years.
[1580–90; < Latin lūstrum; compare luster1]

lustrum, luster, lustre

a period of five years.
See also: Calendar
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.lustrum - a period of five years
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
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