[ad. L. vitiātio (rare), or f. VITIATE v.] The action of vitiating, the fact or state of being vitiated, in senses of the verb.

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1635.  Jackson, Creed, VIII. xx. § 5. No addition is forbidden, but such as includeth a vitiation of the text.

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1658.  Phillips, Vitiation, a corrupting or defiling; also a deflowring.

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1666.  G. Harvey, Morb. Angl., xvii. (1672), 35. The cause of the foresaid extenuation of body … is imputed to … the bloods vitiation by malign putrid vapors, smoaking throughout the vessels.

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1802.  Paley, Nat. Theol., xxvi. (1819), 429. That vitiation of taste which frequently occurs in fevers, when every taste is irregular and every one bad.

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1809.  W. Irving, Knickerb. (1861), 61. The original name of the island … has already undergone considerable vitiation.

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1843.  Mill, Logic, I. ii. § 5. With the least vitiation of the truth of any propositions.

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1863.  Geo. Eliot, Romola, xxv. No man ever struggled to retain power over a mixed multitude without suffering vitiation.

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