D defs.my
Entry 1 sense Webster, 1913

Summation

/səm-āsh'-ən/ · Sum·ma·tion · IPA /sʌˈmeɪʃən/
01 n. The act of summing, or forming a sum, or total amount; also, an aggregate.
  1. 1.
    The act of summing, or forming a sum, or total amount; also, an aggregate.
    “Of this series no summation is possible to a finite intellect.” De Quincey.