Definition of summation
1
: the act or process of forming a sum : addition
3
: cumulative action or effect
especially
: the process by which a sequence of stimuli that are individually inadequate to produce a response are cumulatively able to induce a nerve impulse
4
: a final part of an argument reviewing points made and expressing conclusions
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Merriam-Webster unabridged
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Time Traveler for summation
The first known use of summation was in 1760
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