sum

noun

1
the whole amount
2
a quantity obtained by the addition of a group of numbers
3
the choicest or most essential or most vital part of some idea or experience
the gist of the prosecutor's argument
the heart and soul of the Republican Party
4
the final aggregate
the sum of all our troubles did not equal the misery they suffered
5
a set containing all and only the members of two or more given sets
let C be the union of the sets A and B
6
a quantity of money
he borrowed a large sum
the amount he had in cash was insufficient

1
determine the sum of
Add all the people in this town to those of the neighboring town
2
be a summary of
The abstract summarizes the main ideas in the paper

Also useful for “sum”:Unscrambler— Turn loose letters into real words