definition of
sum

[1] #1 sum n. [sum of money, amount, amount of money] a quantity of money; "he borrowed a large sum"; "the amount he had in cash was insufficient". wn

[2] #2 sum n. [amount, total] a quantity obtained by the addition of a group of numbers. wn

[3] #3 sum n. [summation, sum total] the final aggregate; "the sum of all our troubles did not equal the misery they suffered". wn

[4] #4 sum n. [kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, nitty-gritty] 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". wn

[5] #5 sum n. [total, totality, aggregate] the whole amount. wn