noun (plural lustra /-trə/ or lustrums)chiefly literary historical
A period of five years.
- The book is dedicated to Nygren's wife Irmgard "in thankfulness for seven lustrums of theological cooperation."
- 37 years ago my first secretary was a lady who has remained my friend for nearly 8 lustrums (4 decades) and today is a leading lady lawyer in Los Angeles who has never lost a case in court.
Late 16th century: from Latin, originally denoting a purificatory sacrifice after a quinquennial census.
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