[vi.ti.ate] vt -at.ed ; -at.ing [L vitiatus, pp. of vitiare, fr. vitium fault, vice] (1534) 1: to make faulty or defective: impair "the comic impact is vitiated by obvious haste --William Styron"
2: to debase in moral or aesthetic status "a mind vitiated by prejudice"
3: to make ineffective "fraud ~s a contract" syn see debase -- vi.ti.a.tion n -- vi.ti.a.tor n