noun (1)
\ ˈsəm How to pronounce sum (audio) \

Definition of sum

 (Entry 1 of 3)

1 : an indefinite or specified amount of money
2 : the whole amount : aggregate
3 : the utmost degree : summit reached the sum of human happiness
4a : a summary of the chief points or thoughts : summation the sum of this criticism follows— C. W. Hendel
b : gist the sum and substance of an argument
5a(1) : the result of adding numbers the sum of 5 and 7 is 12
(2) : the limit of the sum of the first n terms of an infinite series as n increases indefinitely
b : numbers to be added broadly : a problem in arithmetic
in sum
: in short : briefly


summed; summing

Definition of sum (Entry 2 of 3)

transitive verb

1 : to calculate the sum of : total
2 : summarize

intransitive verb

: to reach a sum : amount


noun (2)
\ ˈsəm How to pronounce sum (audio) \
plural sums

Definition of sum (Entry 3 of 3)

the basic monetary unit of Uzbekistan — see Money Table

Other Words from sum

Noun (1)

summability \ ˌsə-​mə-​ˈbi-​lə-​tē How to pronounce sum (audio) \ noun
summable \ ˈsə-​mə-​bəl How to pronounce sum (audio) \ adjective

Examples of sum in a Sentence

Verb can sum figures in his head faster than I can punch them into a calculator

First Known Use of sum

Noun (1)

14th century, in the meaning defined at sense 1


14th century, in the meaning defined at transitive sense 1

Noun (2)

1993, in the meaning defined above

History and Etymology for sum

Noun (1)

Middle English summe, from Anglo-French sume, somme, from Latin summa, from feminine of summus highest; akin to Latin super over — more at over

Noun (2)

Uzbek so'm ruble

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Time Traveler for sum

Time Traveler

The first known use of sum was in the 14th century

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Cite this Entry

“Sum.” Dictionary, Merriam-Webster, Accessed 20 May. 2022.

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More Definitions for sum


\ ˈsəm How to pronounce sum (audio) \

Kids Definition of sum

 (Entry 1 of 2)

1 : the result obtained by adding numbers The sum of 4 and 5 is 9.
2 : a problem in arithmetic
3 : a quantity of money We donated a small sum.
4 : the whole amount Two trips is the sum of my travel experience.


summed; summing

Kids Definition of sum (Entry 2 of 2)

: to find the total number of by adding or counting
sum up
: to tell again in a few words : summarize

More from Merriam-Webster on sum

Nglish: Translation of sum for Spanish Speakers

Britannica English: Translation of sum for Arabic Speakers


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