LUSTRUM
lustrum
(noun) a ceremonial purification of the Roman population every five years following the census
lustrum
(noun) a period of five years
Source: WordNet® 3.1
Etymology
Noun
lustrum (plural lustra or lustrums)
(Ancient Rome, religion, historical) A ceremonial purification of all the people, performed every five years after the taking of the census; a lustration. [from late 16th c.]
(by extension, literary) A period of five years.
Synonyms: luster, lustre, quinquennium
Notes
Source: Wiktionary
Lus"trum, n.; pl. E. Lustrums, L. Lustra. Etym: [L. Cf. 2d & 3d
Luster.]
Definition: A lustration or purification, especially the purification of
the whole Roman people, which was made by the censors once in five
years. Hence: A period of five years.
Source: Webster’s Unabridged Dictionary 1913 Edition