Webster's English Dictionary

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annul

Cross references:
  1. nullify               
 
an.nul \*-'n*l\ vt or an.nulled;  or an.nul.ling [ME annullen, fr. MF 
   annuller, fr. LL annullare, fr. L ad-] + nullus not any - more at NULL 1: 
   to reduce to nothing : OBLITERATE  2: to make ineffective or inoperative : 
   NEUTRALIZE {~ the  drug's effect} 3: to declare or make legally void