Webster's English Dictionary

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negation

ne.ga.tion \ni-'ga--sh*n\ \-shn*l, -sh*n-*l\ n 1a: the action of negating : 
   DENIAL  1b: a negative doctrine or statement  2a: something that is the 
   absence of something actual : NONENTITY  2b: something that is the negative 
   opposite of something positive  - ne.ga.tion.al aj