Luster, Lustre, Lustrum
Luster, Lustre, Lustrum : A traditional unit of time equal to 5 years. In ancient Rome the Lustrum was a ceremony of expiation and purification for the whole population of the city, carried out every 5 years after the completion of the census. The use of luster or lustrum as a unit of time in English was fairly common in well-educated circles as long as "well-educated" meant classically educated; the unit has pretty much disappeared today
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