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summation (n.)

1760, "process of calculating a sum," from Modern Latin summationem (nominative summatio) "an adding up," noun of action from Late Latin summatus, past participle of summare "to sum up," from Latin summa (see sum (n.)). Meaning "a summing up" is from 1836.

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Definitions of summation

summation (n.)
a concluding summary (as in presenting a case before a law court);
Synonyms: summing up / rundown
summation (n.)
(physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce;
summation (n.)
the arithmetic operation of summing; calculating the sum of two or more numbers;
the summation of four and three gives seven
Synonyms: addition / plus
summation (n.)
the final aggregate;
Synonyms: sum / sum total
From wordnet.princeton.edu