lustrum: Meaning and Definition of

lus•trum

Pronunciation: (lus'trum), [key]
— pl. -trums, -tra
  1. a period of five years.
  2. a lustration or ceremonial purification of the people, performed every five years, after the taking of the census.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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