sum in WordNet English dictionary

1. determine the sum of
   "Add all the people in this town to those of the neighboring town"
   total  tot  tot up  sum  sum up  summate  tote up  add  add together  tally  add up 
   
2. be a summary of
   "The abstract summarizes the main ideas in the paper"
   summarize  summarise  sum  sum up 
   

1. the whole amount
   sum  total  totality  aggregate 
   
2. a quantity obtained by the addition of a group of numbers
   sum  amount  total 
   
3. a quantity of money
   "he borrowed a large sum"; "the amount he had in cash was insufficient"
   sum  sum of money  amount  amount of money 
   
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"
   kernel  substance  core  center  centre  essence  gist  heart  heart and soul  inwardness  marrow  meat  nub  pith  sum  nitty-gritty 
   
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"
   union  sum  join 
   
6. the final aggregate
   "the sum of all our troubles did not equal the misery they suffered"
   sum  summation  sum total