n. 清净, 洁净

Lustration \Lus*tra"tion\, n. [L. lustratio: cf. F. lustration.]
1. The act of lustrating or purifying.

And holy water for lustration bring. --Dryden.

2. (Antiq.) A sacrifice, or ceremony, by which cities,
fields, armies, or people, defiled by crimes, pestilence,
or other cause of uncleanness, were purified.