1. (n.)sum the aggregate of two or more numbers, magnitudes, quantities, or particulars as determined by or as if by the mathematical process of addition: The sum of 6 and 8 is 14.
2. sum an amount or quantity, esp. of money: to lend small sums.
3. sum a series of numbers or quantities to be added up.
4. sum an arithmetical problem to be solved, or such a problem worked out and having the various steps shown.
5. sum the full amount, or the whole: the sum of our knowledge.
6. sum the main idea, gist, or point: the sum and substance of his argument.
7. sum a summary.
8. (v.t.)sum to combine into an aggregate or total (often fol. by up).
9. sum to ascertain the sum of, as by addition.
10. sum to bring into or contain in a smallcompass (often fol. by up).
3. (noun)sum, summation, sum total the finalaggregate "the sum of all our troubles did not equal the misery they suffered"
4. (noun)kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty 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"
5. (noun)sum, total, totality, aggregate the wholeamount
6. (verb)union, sum, join a set containing all and only the members of two or moregiven sets "let C be the union of the sets A and B"
7. (verb)summarize, summarise, sum, sum up be a summary of "The abstract summarizes the main ideas in the paper"
8. (verb)total, tot, tot up, sum, sum up, summate, tote up, add, add together, tally, add up determine the sum of "Add all the people in this town to those of the neighboring town"
4. (verb)sum to briefly state the main points It is difficult to sum up how I feel in just a few words.
Definition of 'Sum'
Webster Dictionary
1. (noun)Sum 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
2. (noun)Sum a quantity of money or currency; any amount, indefinitely; as, a sum of money; a small sum, or a large sum
3. (noun)Sum 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
5. (noun)Sum a problem to be solved, or an example to be wrought out
6. (verb)Sum 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
7. (verb)Sum to bring or collect into a small compass; to comprise in a few words; to condense; -- usually with up
8. (verb)Sum to have (the feathers) full grown; to furnish with complete, or full-grown, plumage
Definitions of Sum 
Afrikaans: som
Arabic: مَجموع
Bulgarian: сбор
Brazilian: soma
Czech: součet
German: die Summe
Danish: sum
Greek: άθροισμα
Spanish: suma
Estonian: summa
Farsi: حاصل جمع
Finnish: summa
French: somme
Hebrew: סְכוּם
Hindi: योग, योगफल, जोड़
Croatian: zbroj
Hungarian: összeg
Indonesian: jumlah
Icelandic: summa
Italian: somma
Japanese: 合計
Korean: 함계
Lithuanian: suma
Latvian: summa
Malay: hasil tambah
Dutch: som
Norwegian: sum
Polish: suma
Persian: حاصل جمع
Pashto: د جمعی حاصل
Portuguese: soma
Romanian: sumă, total
Russian: сумма; итог
Slovak: súčet
Slovenian: vsota
Serbian: suma
Swedish: summa
Thai: จำนวนรวม
Turkish: toplam
Taiwanese: 和，總數
Ukrainian: сума; підсумок
Urdu: میزان
Vietnamese: tổng số, tổng
Chinese: 和，总数
