[ verb ] purify by means of a ritual; also used in post-Communist countries to refer to the political cleansing of former officials <verb.change>
Lustrate \Lus"trate\, v. t. [imp. & p. p. {Lustrated}; p. pr. & vb. n. {Lustrating}.] [L. lustratus, p. p. of lustrare to lustrate, fr. lustrum. See {Lustrum}.] To make clear or pure by means of a propitiatory offering; to purify.
We must purge, and cleanse, and lustrate the whole city. --Hammond.