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From The Collaborative International Dictionary of English v.0.48:
Vitiation \Vi`ti*a"tion\, n. [L. vitiatio.] The act of vitiating, or the state of being vitiated; depravation; corruption; invalidation; as, the vitiation of the blood; the vitiation of a contract. [1913 Webster] The vitiation that breeds evil acts. --G. Eliot. [1913 Webster]