From WordNet (r) 3.0 (2006):
sum
n 1: a quantity of money; "he borrowed a large sum"; "the amount
he had in cash was insufficient" [syn: sum, sum of
money, amount, amount of money]
2: a quantity obtained by the addition of a group of numbers
[syn: sum, amount, total]
3: the final aggregate; "the sum of all our troubles did not
equal the misery they suffered" [syn: sum, summation,
sum total]
4: 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" [syn: kernel, substance, core, center,
centre, essence, gist, heart, heart and soul,
inwardness, marrow, meat, nub, pith, sum, nitty-
gritty]
5: the whole amount [syn: sum, total, totality,
aggregate]
6: 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" [syn:
union, sum, join]
v 1: be a summary of; "The abstract summarizes the main ideas in
the paper" [syn: summarize, summarise, sum, sum up]
2: determine the sum of; "Add all the people in this town to
those of the neighboring town" [syn: total, tot, tot
up, sum, sum up, summate, tote up, add, add
together, tally, add up]