What is the meaning of sum?

noun

• A quantity of money.
  • usage: "he borrowed a large sum"; "the amount he had in cash was insufficient"
  • synonyms: sum of money, amount, amount of money
• A quantity obtained by the addition of a group of numbers.
  • synonyms: amount, total
• The final aggregate.
  • usage: "the sum of all our troubles did not equal the misery they suffered"
  • synonyms: summation, sum total
• The choicest or most essential or most vital part of some idea or experience.
  • usage: "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
  • synonyms: kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, nitty-gritty
• The whole amount.
  • synonyms: total, totality, aggregate
• A set containing all and only the members of two or more given sets.
  • usage: "let C be the union of the sets A and B"
  • synonyms: union, join

verb

• Be a summary of.
  • usage: "The abstract summarizes the main ideas in the paper"
  • synonyms: summarize, summarise, sum up
• Determine the sum of.
  • usage: "Add all the people in this town to those of the neighboring town"
  • synonyms: total, tot, tot up, sum up, summate, tote up, add, add together, tally, add up