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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.
vitiation vi·ti·a·tion (vĭsh'ē-ā'shən)n. A change in a process that impairs utility or reduces efficiency.