Definition of sum
1
:an indefinite or specified amount of money
2
:the whole amount :aggregate
3
:the utmost degree :summit
- reached the sum of human happiness
4 a
: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
5 a (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
c (1)
:disjunction 2
(2)
:union 2d
