nul·li·fy /ˈnʌləˌfaɪ/
 (vt.)使無效,廢棄,取消


 Nul·li·fy v. t. [imp. & p. p. Nullified p. pr. & vb. n. Nullifying ]  To make void; to render invalid; to deprive of legal force or efficacy.
    Such correspondence would at once nullify the conditions of the probationary system.   --I. Taylor.
 Syn: -- To abrogate; revoke; annul; repeal; invalidate; cancel. See Abolish.

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 nullify
      v 1: declare invalid; "The contract was annulled"; "void a plea"
           [syn: invalidate, annul, quash, void, avoid]
           [ant: validate]
      2: show to be invalid [syn: invalidate] [ant: validate]
      3: make ineffective by counterbalancing the effect of; "Her
         optimism neutralizes his gloom"; "This action will negate
         the effect of my efforts" [syn: neutralize, neutralise,
          negate]
      [also: nullified]