lustrum

Noun

lustrum (plural lustra or lustrums)

1. (historical) A lustration: a ceremonial purification of the people of Rome performed every five years after the census.
   • [A]ll theſe Magiſtrates were elected by, and from, the whole promiſcuous Body of the People in their public Aſſemblies; that after the Inſtitution of Cenſors, it was look'd upon as a Matter of Form only, that they should enroll the new Senators at the next general Luſtrum, or Survey of the...1746 February 28, “A Treatise on the Roman Senate, in Two Parts. By Conyers Middleton, D.D. Principal Library-keeper of the University of Cambridge. Printed for R. Manby, and H. S. Cox, 1747. Octavo....
   • The interval of time supposed to have been denoted by the Roman Lustrum has been made the subject of controversy. No one however as far as we know has ever assumed it at less than four years or as more than five; so that the status quæstionis may so far be considered as fixed and agreed upon: and...1854, Edward Greswell, “Dissertation X. On the Lustral Cycle of the Romans and on the Initia Censoria”, in Origines Kalendariæ Italicæ, Nundinal Calendars of Ancient Italy, Nundinal Calendar of...

   Synonyms:

   luster

2. (broadly, literary) Synonym of quinquennium: Any 5-year period.
   • We puſh Time from us, and we wiſh Him back; / Laviſh of Luſtrums, and yet fond of Life; / Life we think long, and ſhort; Death ſeek, and ſhun; […]1742–1745, [Edward Young], “Night the Second. On Time, Death, Friendship. Humbly Inscrib’d to the Right Honourable the Earl of Wilmington.”, in The Complaint: Or, Night-thoughts on Life, Death, &...
   • Thus passed away two lustra of her life, and, as yet, my daughter remained nameless upon the earth. "My child," and "my love," were the designations usually prompted by a father's affection, and the rigid seclusion of her days precluded all other intercourse. Morella's name died with her at her...1835 April, Edgar Allan Poe, “Morella”, in The Southern Literary Messenger: Devoted to Every Department of Literature, and the Fine Arts, Richmond, Va.: T. W. White, →OCLC; republished in The Works...

   Synonyms:

   quinquennium