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A "lustrum" is a term that historically refers to a period of five years. The word has its origins in ancient Rome, where it denoted a ceremonial purification conducted every five years, which involved a census of the population and a ritual to appease the gods. In modern usage, "lustrum" can simply denote any five-year span, particularly in contexts such as academic or financial reporting, anniversaries, or other periodic evaluations.

Ancestors (6)

  1. Units of time
  2. Units of measurement
  3. Quantity
  4. Mathematical concepts
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