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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“Lustrum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lustrum. Accessed 28 Jan. 2022.
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Time Traveler for lustrum
The first known use of lustrum was in 1590
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