LUSTRUM, in Roman antiquity, a general muster
and review of all the citizens and their goods, which
was performed by the censors every fifth year, who
afterwards made a solemn lustration. See the article
LUSTRATION.
This custom was first instituted by Servius Tullius,
about 180 years after the foundation of Rome. In
course of time the lustra were not celebrated so often;
for we find the fifth lustrum celebrated at Rome only
in the 374th year of that city.