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.
  ◄ ►
  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]
  nullified
       adj : deprived of legal force [syn: invalidated]