English Wikipedia has an article on:

summation

Wikipedia

From sum +‎ -ation.

• (Received Pronunciation) IPA^(key): /sʌˈmeɪʃən/

• Audio (Southern England):

  (file)

• Rhymes: -eɪʃən

summation (countable and uncountable, plural summations)

1. summarization; summary; summing up.
   • 2021 December 29, Stephen Roberts, “Stories and facts behind railway plaques: Bournemouth (circa 1880)”, in RAIL, number 947, page 59:

     In a summation of changed times, we have a lost station site in Bournemouth (now occupied by a coach park) as well as its former hotel (still clinging on as apartments).

2. (mathematics) summing; summing up; adding (adding up) of a series of items.

• sum
• summate

• addition, summation: (augend) + (addend) = (summand) + (summand) = (sum, total)
• subtraction: (minuend) − (subtrahend) = (difference)
• multiplication: (multiplier) × (multiplicand) = (factor) × (factor) = (product)
• division: (dividend) ÷ (divisor) = (quotient), remainder left over if divisor does not divide dividend
• integration
• Σ

• “summation”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.