[ luhs-truhm ]
See synonyms for: lustrumlustralustrums on

noun,plural lus·trums, lus·tra [luhs-truh]. /ˈlʌs trə/.
  1. a period of five years.

  2. Roman History. a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.

Origin of lustrum

First recorded in 1580–90; from Latin lūstrum; cf. luster1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use lustrum in a sentence

  • Thus passed away two lustra of her life, and as yet my daughter remained nameless upon the earth.

  • Lustra-cellulose prepared by spinning a solution of cellulose in concentrated chloride of zinc.

  • Concentrated nitric acid attacks the natural silks powerfully in the cold; the lustra-celluloses dissolve on heating.

  • The China silk was dissolved by this reagent; Tussah silk and the lustra-celluloses entirely resisted its action.

  • Millon's reagent, at the boiling solution, colours the natural silks violet: the lustra-celluloses give no reaction.

British Dictionary definitions for lustrum



/ (ˈlʌstrəm) /

nounplural -trums or -tra (-trə)
  1. a period of five years

Origin of 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