| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| lustrum |
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| SYLLABICATION: | lus·trum |
| PRONUNCIATION: |  l s tr m |
| NOUN: | Inflected forms: pl. lus·trums or lus·tra (-tr)
1. A ceremonial purification of the entire ancient Roman population after the census every five years. 2. A period of five years. | | ETYMOLOGY: | Latin l strum. See luster.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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