Webster's English Dictionary

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nullify

nul.li.fy \'n*l-*-.fi-\ vt [LL nullificare, fr. L nullus] 1: to make null; 
   specif : ANNUL  2: to make of no value or consequence ATE mean to deprive 
   of effective or continued existence. NULLIFY implies counteracting 
   completely the force, effectiveness, or value of something; NEGATE implies 
   the destruction or canceling out of each of two things by the other; ANNUL 
   suggests making ineffective or nonexistent often by legal or official 
   action; ABROGATE is like ANNUL but more definitely implies a legal or 
   official purposeful act; INVALIDATE implies making something powerless or 
   unacceptable by declaration of its logical or moral or legal unsoundness 
   SYN syn NULLIFY, NEGATE, ANNUL, ABROGATE, INVALID