损害,败坏,使无效
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. The vitiation that breeds evil acts. --G. Eliot.
vitiation n : nullification by the destruction of the legal force; rendering null; "the vitiation of the contract"