Cite
 

Meaning of lustrum

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.
See also: