Webster's English Dictionary

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negate

Cross references:
  1. nullify               
 
ne.gate or ne.gat.er \ni-'ga-t\ \-'ga-t-*r\ vt [L negatus, pp. of negare to 
   say no, deny, fr. neg- no, not (]akin to ne- not) - more at NO 1: to deny 
   the existence or truth of  2: to cause to be ineffective or invalid  - 
   negate n