Webster's English Dictionary

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summation

sum.ma.tion \(.)s*-'ma--sh*n\ \-shn*l, -sh*n-*l\ n 1: the act or process of 
   forming a sum : ADDITION  2: SUM, TOTAL  3: cumulative action or effect 
   esp. of individually subliminal stimuli  4: a final part of an argument 
   reviewing points made and expressing conclus ions - sum.ma.tion.al aj