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vitiate (v.)

"to render vicious, faulty, or imperfect; injure the quality or substance of," 1530s, from Latin vitiatus, past participle of vitiare "to make faulty, injure, spoil, corrupt," from vitium "fault, defect, blemish, crime, vice" (see vice (n.1)). Related: Vitiated; vitiating.

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