Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. Mathematics An amount obtained as a result of adding numbers.
 n. Mathematics An arithmetic problem: a child good at sums.
 n. The whole amount, quantity, or number; an aggregate: the sum of the team's combined experience.
 n. An amount of money: paid an enormous sum.
 n. A summary: my view of the world, in sum.
 n. The central idea or point; the gist.
 transitive v. Mathematics To add.
 transitive v. To give a summary of; summarize.
 sum up To present the substance of (material) in a condensed form; summarize: sum up the day's news; concluded the lecture by summing up.
 sum up To describe or assess concisely: an epithet that sums up my feelings.
 n. See Table at currency.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A quantity obtained by addition or aggregation.
 n. An arithmetic computation, especially one posed to a student as an exercise (not necessarily limited to addition).
 n. A quantity of money.
 n. A summary.
 n. A central idea or point.
 n. The utmost degree.
 n. An old English measure of corn equal to the quarter.
 v. To add together.
 v. To give a summary of.
 n. The basic unit of money in Kyrgyzstan.
 n. The basic unit of money in Uzbekistan.
from the GNU version of the Collaborative International Dictionary of English
 n. The aggregate of two or more numbers, magnitudes, quantities, or particulars; the amount or whole of any number of individuals or particulars added together.
 n. A quantity of money or currency; any amount, indefinitely.
 n. The principal points or thoughts when viewed together; the amount; the substance; compendium.
 n. Height; completion; utmost degree.
 n. A problem to be solved, or an example to be wrought out.
 transitive v. 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.
 transitive v. To bring or collect into a small compass; to comprise in a few words; to condense;  usually with up.
 transitive v. To have (the feathers) full grown; to furnish with complete, or fullgrown, plumage.
from The Century Dictionary and Cyclopedia
 To combine into a total or sum; add together; ascertain the totality of: often followed by up.
 To bring or collect into a small compass; condense in a few words: usually with up: as, to sum up evidence; to sum up arguments.
 In falconry, to have (the feathers) full grown and in full number.
 Hence To supply with full clothing.
 In the calculus of finite differences, to find the general expression for the aggregate of: said of the result of adding successive values of a given function in each of which the variable is increased over the last by unity. See sum, n., 7.
 To make a recapitulation; offer a brief statement of the principal points or substance: usually with up.
 An obsolete spelling of some.
 See some.
 n. The highest point: the top; summit; completion; full amount; total; maximum.
 n. The whole; the principal points or thoughts when viewed together; the substance.
 n. The aggregate of two or more numbers, magnitudes, quantities, or particulars; the result of the process of addition: as, the sum of 5 and 7 is 12; the sum of a and b is a + b.
 n. Hence The whole number or quantity.
 n. A quantity of money or currency; an indefinite amount of money.
 n. An arithmetical problem to be solved, or an example of a rule to be worked out; also, such a problem worked out and the various steps shown.
 n. In the calculus of finite differences, a function the result of operating upon another function with the sign of summation, and expressing the addition of all successive values of that function in which the variable differs from unit to unit from zero or other constant value to one less than the value indicated; also, a special value of such a function. Thus, the sum of r is
 n. or, since the summation may commence at any other integral value of x, ϲ r = r / (r—1) + C, where C is an arbitrary constant or periodic function having for its period a submultiple of unity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 v. determine the sum of
 n. a quantity of money
 n. the final aggregate
 n. a set containing all and only the members of two or more given sets
 n. a quantity obtained by the addition of a group of numbers
 n. the choicest or most essential or most vital part of some idea or experience
 n. the whole amount
 v. be a summary of
Etymologies
Examples

Totos ego tredecim annos, quibus functus sum ministerio, sive in sacramentis, sive in aliis sacris celebrandis, exhortationibus aut precibus quae extant in Agendâ nostrâ, _nunquam usus sum_.
The Scottish Reformation Its Epochs, Episodes, Leaders, and Distinctive Characteristics

The proportionate postage from this commerce, even at the ratio of the present West Indian postage, to and from Great Britain and her West Indian colonies, would be 110,000_l. _ yearly; but admitting that a sum equal to _onehalf_ only of _this sum_ came from the letters sent through the British Post Office, the sum gained on this station yearly would be 55,000_l.

Draining me of the last cent of my hard earnings, he would, however, occasionally  when I brought {252} home an extra large sum  dole out to me a sixpence or a shilling, with a view, perhaps, of kindling up my gratitude; but this practice had the opposite effect  it was an admission of _my right to the whole sum_.

SELECT sum (p_numofrasname) as p_numofrasname, sum (nvl (p_numof1stareacnt,0)) as p_numof1stareacnt, sum (nvl (p_numof2stareacnt,0)) +sum (nvl (p_numof1stareacnt,0)) as p_numof2stareacnt

The problem with the ‘vector sum’ formulation is that it ignores several crucial properties of the system: the ‘vectors’ are not independent, the ’sum’ feeds back into the individual vectors, and the operation of summation is nonlinear.

I remember that at another festivity given by the city to the Emperor a few years later, since all inscription had been exhausted, there were placed above the throne on which he was to sit, these words from Scripture, in gold letters: _Ego sum qui sum_,  and no one was shocked. "

Individual accomplishments are important, but the sum is always greater in value than the individual parts.

“If the sum is not sufficient,” Dick said stiffly, “why name the sum you consider fair.”

Our current system is a faltering machine whose product is benign genocide  which I define as the sum total of global deaths that result from the way the system is set up.
Stephen C. Rose: Further Thoughts on "Our Crisis Is Not Economic"

It was in these that Gruenwald introduced the concept of the “Omniverse,” which he described as the sum total of all universes.
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