SINCE 1828
lustrum
noun
lus·trum
| \ ˈlə-strəm
\
\
plural lustrums
or lustra\ ˈlə-strə
\
\
Definition of lustrum
1
: a period of five years
2a
: a purification of the whole Roman people made in ancient times after the census every five years
b
: the Roman census
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