sum
noun.
a quantity of money
he borrowed a large sum|the amount he had in cash was insufficient
noun.
a quantity obtained by the addition of a group of numbers
Synonym: amount, total
noun.
the final aggregate
the sum of all our troubles did not equal the misery they suffered
noun.
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|the nub of the story
noun.
the whole amount
noun.
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
Synonym: join, union
verb.
be a summary of
The abstract summarizes the main ideas in the paper
verb.
determine the sum of
Add all the people in this town to those of the neighboring town