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Lustrum (Noun)

A period of five years.

Nouns denoting time and temporal relations.

The company reviews its long-term strategy every lustrum to ensure it stays competitive in the market.
A lustrum has passed since the city last hosted the international music festival, and preparations are underway for the next event.
The government has announced plans to increase funding for education over the next lustrum in an effort to improve literacy rates.
The team of researchers has been studying the effects of climate change over the past lustrum and will soon publish their findings.
The university awards a special scholarship to outstanding students every lustrum, recognizing their academic achievements and potential.

A ceremonial purification of the Roman population every five years following the census.

Nouns denoting acts or actions.

The Roman Republic would conduct a lustrum after the completion of each census to purify the population and cleanse it of past transgressions.
In ancient Rome, the lustrum ceremony involved the sacrifice of animals and a procession around the city to mark the occasion.
Every five years, the Roman authorities would hold a lustrum to coincide with the conclusion of the census and to ensure the continued prosperity of the state.
The Roman tradition of the lustrum was a significant event in the civic calendar, symbolizing renewal and spiritual rejuvenation.
During the lustrum, the censors would lead the purification rituals and perform the necessary sacrifices to atone for past wrongdoings.