vitiation
         n 1: nullification by the destruction of the legal force;
               rendering null; "the vitiation of the contract"

English Dictionary: vote down	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
vote down v thwart the passage of; "kill a motion"; "he shot down the student's proposal" Synonym(s): kill, shoot down, defeat, vote down, vote out vote against; "The faculty turned thumbs down on the candidate for the Dean position" Synonym(s): turn thumbs down, vote down
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Viduation \Vid`u*a"tion\, n.       The state of being widowed or bereaved; loss; bereavement.       [R.]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Vitiate \Vi"ti*ate\, v. t. [imp. & p. p. {Vitiated}; p. pr. &       vb. n. {Vitiating}.] [L. vitiatus, p. p. vitiare to vitiate,       fr. vitium a fault, vice. See {Vice} a fault.] [Written also       {viciate}.]       1. To make vicious, faulty, or imperfect; to render             defective; to injure the substance or qualities of; to             impair; to contaminate; to spoil; as, exaggeration             vitiates a style of writing; sewer gas vitiates the air.                         A will vitiated and growth out of love with the                      truth disposes the understanding to error and                      delusion.                                          --South.                         Without care it may be used to vitiate our minds.                                                                               --Burke.                         This undistinguishing complaisance will vitiate the                      taste of readers.                              --Garth.          2. To cause to fail of effect, either wholly or in part; to             make void; to destroy, as the validity or binding force of             an instrument or transaction; to annul; as, any undue             influence exerted on a jury vitiates their verdict; fraud             vitiates a contract.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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.