LUSTRUM


Meaning of LUSTRUM in English

[ 'lʌstrəm ]

■ noun ( plural lustra -trə or ~s ) chiefly historical a period of five years.

Origin

C16: from L., orig. denoting a purificatory sacrifice after a five-yearly census.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.