sum: Meaning and Definition of


Pronunciation: (sum), [key]
— n., v., summed, sum•ming.
  1. 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.
    1. the limit of the sequence of partial sums of a given infinite series.
    2. union (def. 10a).
  9. a summary.
  1. to combine into an aggregate or total (often fol. by up).
  2. to ascertain the sum of, as by addition.
  3. to bring into or contain in a small compass (often fol. by up).
  1. to amount (usually fol. by to or into): Their expenses summed into the thousands.
  2. We summed up our assets and liabilities.
    1. to reckon:We summed up our assets and liabilities.
    2. to bring into or contain in a brief and comprehensive statement; summarize:to sum up the case for the prosecution.
    3. to form a quick estimate of:I summed him up in a minute.


Pronunciation: [key]
  1. var. ofbefore m: summon.


Pronunciation: [key]
  1. surface-to-underwater missile.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
  • sum (Thesaurus)