Meaning of lustrum in English:


Pronunciation /ˈlʌstrəm/

nounplural noun lustra/ˈlʌstrə/ , plural noun lustrums

  • 1Roman History
    A purificatory sacrifice made after a census every 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.’
  • 2 rare A period of five years.


Late 16th century Latin, probably from luere ‘to wash’.