Webster's Revised Unabridged Dictionary · 1913

Sum

Sum , noun

[Old English summe, somme, Old French sume, some, French somme, Latin summa, from summus highest, a superlative from sub under. See Sub-, and compare Supreme.]

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. — Num. i. 2

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. — Chaucer
With a great sum obtained I this freedom. — Acts xxii. 28
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. — Milton
5.
(Arithmetic) A problem to be solved, or an example to be wrought out. — Macaulay
A sum in arithmetic wherein a flaw discovered at a particular point is ipso facto fatal to the whole. — Gladstone
A large sheet of paper... covered with long sums. — Dickens
Collocations (2)
Algebraic sum , as distinguished from arithmetical sum, the aggregate of two or more numbers or quantities taken with regard to their signs, as + or -, according to the rules of addition in algebra; thus, the algebraic sum of -2, 8, and -1 is 5.
In sum , in short; in brief. [Obsolete] In sum, the gospel... prescribes every virtue to our conduct, and forbids every sin. — Rogers

Sum , transitive verb

[Compare French sommer, Late Latin summare.]

1.
To bring together into one whole; to collect into one amount; to cast up, as a column of figures; to ascertain the totality of; -- usually with up.
The mind doth value every moment, and then the hour doth rather sum up the moments, than divide the day. — Bacon
2.
To bring or collect into a small compass; to comprise in a few words; to condense; -- usually with up.
“Go to the ant, thou sluggard,” in few words sums up the moral of this fable. — L'Estrange
He sums their virtues in himself alone. — Dryden
3.
(Falconry) To have (the feathers) full grown; to furnish with complete, or full-grown, plumage.
But feathered soon and fledge They summed their pens [wings]. — Milton
Collocations (1)
Summing up , a compendium or abridgment; a recapitulation; a résumé; a summary.