Five-Year Period of Ancient Rome

This page is the CodyCross answer for the clue below from The 90s, Group 1127, Puzzle 1 (Rachel Haircut).

Question is: Five-Year Period of Ancient Rome

and the answer is: LUSTRUM

Word Meaning:

LUSTRUM — (historical) A lustration: a ceremonial purification of the people of Rome performed every five years after the census.

Definitions from Wiktionary.