LUSTRATION
Etymology
Noun
lustration (countable and uncountable, plural lustrations)
(religion) A rite of purification, especially washing.
(politics, law) The restoration of credibility to a government by the purging of perpetrators of crimes committed under an earlier regime.
Source: Wiktionary
Lus*tra"tion, n. Etym: [L. lustratio: cf. F. lustration.]
1. The act of lustrating or purifying.
And holy water for lustration bring. Dryden.
2. (Antiq.)
Definition: A sacrifice, or ceremony, by which cities, fields, armies, or
people, defiled by crimes, pestilence, or other cause of uncleanness,
were purified.
Source: Webster’s Unabridged Dictionary 1913 Edition