definitions

lustrum

[ luhs-truh m ]
/ ˈlʌs trəm /
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noun, plural lus·trums, lus·tra [luhs-truh] /ˈlʌs trə/.

Also luster; especially British, lustre. a period of five years.
Roman History. a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.

RELATED WORDS

cinquefoil, pentangle, pentagram, quintuple, cinque, quinquennium, pentacle, quintuplet, pentagon, limerick, pentad, quincunx, quinquennial, quintuplicate

Nearby words

lustrate, lustre, lustreware, lustring, lustrous, lustrum, lusty, lusus naturae, lut desert, lutanist, lute

Origin of lustrum

1580–90; < Latin lūstrum; cf. luster1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for lustrum

lustrum

lustre

/ (ˈlʌstrəm) /

noun plural -trums or -tra (-trə)

a period of five years

Word Origin for lustrum

C16: from Latin: ceremony of purification, from lustrāre to brighten, purify
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012