lustration

from The Collaborative International Dictionary of English v.0.48

Lustration \Lus*tra"tion\, n. [L. lustratio: cf. F. lustration.]
   1. The act of lustrating or purifying.
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            And holy water for lustration bring.  --Dryden.
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   2. (Antiq.) A sacrifice, or ceremony, by which cities,
      fields, armies, or people, defiled by crimes, pestilence,
      or other cause of uncleanness, were purified.
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