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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Time Traveler for lustrum
The first known use of lustrum was in 1590
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