partial sum

noun Mathematics.
one of a series of sums of elements of a given sequence, the first sum being the first element, the second sum being the first element added to the second element, the third sum being equal to the sum of the first three elements, and so on.

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Then a variation on the usual algorithm is proposed: adding from left to right, writing the partial sum for each stage.
The test statistic is the absolute value of the maximum partial sum divided by the square root of the sample size.
After the array portions have been distributed, the master program must receive a partial sum from each of the worker processes.
Both of these test statistics are functions of the partial sum process of the scores.
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