1.The aggregate of two or more numbers, magnitudes, quantities, or particulars; the amount or whole of any number of individuals or particulars added together; as, the sum of 5 and 7 is 12. "Take ye the sum of all the congregation." Note: Sum is now commonly applied to an aggregate of numbers, and number to an aggregate of persons or things.
2.A quantity of money or currency; any amount, indefinitely; as, a sum of money; a small sum, or a large sum. "The sum of forty pound." "With a great sum obtained I this freedom."
3.The principal points or thoughts when viewed together; the amount; the substance; compendium; as, this is the sum of all the evidence in the case; this is the sum and substance of his objections.
4.Height; completion; utmost degree. "Thus have I told thee all my state, and brought My story to the sum of earthly bliss."
5.(Arith.) A problem to be solved, or an example to be wrought out. "A sum in arithmetic wherein a flaw discovered at a particular point is ipso facto fatal to the whole." "A large sheet of paper... covered with long sums."