a summation or statement made for the purpose of reviewing the basic concepts or principles of an argument, story, explanation, testimony, or the like, and usually presented at the end.
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.
a particular aggregate or total, esp. with reference to money: The expenses came to an enormous sum.
3.
an indefinite amount or quantity, esp. of money: to lend small sums.
4.
a series of numbers or quantities to be added up.
5.
an arithmetical problem to be solved, or such a problem worked out and having the various steps shown.
6.
the full amount, or the whole.
7.
the substance or gist of a matter, comprehensively or broadly viewed or expressed: the sum of his opinions.
8.
concise or brief form: in sum.
9.
Mathematics.
a.
the limit of the sequence of partial sums of a given infinite series.
to combine into an aggregate or total (often fol. by up).
12.
to ascertain the sum of, as by addition.
13.
to bring into or contain in a small compass (often fol. by up).
–verb (used without object)
14.
to amount (usually fol. by to or into): Their expenses summed into the thousands.
—Verb phrase
15.
sum up,
a.
to reckon: We summed up our assets and liabilities.
b.
to bring into or contain in a brief and comprehensive statement; summarize: to sum up the case for the prosecution.
c.
to form a quick estimate of: I summed him up in a minute.
Origin: 1250–1300; (n.) ME summe < L summa sum, n. use of fem. of summus highest, superl. of superus (see superior); (v.) ME summen (< OF summer) < ML summāre, deriv. of summa
[suhm-ing-uhp] 
ɪŋˈʌp