Dictionary![]() ![]() lus•trumPronunciation: (lus'trum), [key] —n., —pl. -trums, -traPronunciation: (-tru). [key] 1. Also,luster; esp. Brit.,lustre.a period of five years. 2. Rom. Hist.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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