vitiation
損害,敗壞,使無效
Vi·ti·a·tion n. 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.
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vitiation
n : nullification by the destruction of the legal force;
rendering null; "the vitiation of the contract"