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The word collustratio could not be parsed. Trying a normal dictionary lookup:
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‡ collustrĭum, ĭi, n. [collustro], a corporation that procured the lustration of the fields of a district, Inscr. Orell. 1773.
col-lustro (conl-), āvi, ātum, 1, v. a., to lighten on all sides, to illumine, brighten (rare but class.; most freq. in Cic.).