Definition of lustrum in English:

lustrum

Syllabification: lus·trum
Pronunciation: /ˈləstrəm
 
/

noun (plural lustra /-trə/ or lustrums)

chiefly • literary historical
  • A period of five years.
    More example sentences
    • 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.

Origin

late 16th century: from Latin, originally denoting a purificatory sacrifice after a quinquennial census.

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