definitions

## Origin of sum

1250–1300; (noun) Middle English summe < Latin summa sum, noun use of feminine of summus highest, superlative of superus (see superior); (v.) Middle English summen (< Old French summer) < Medieval Latin summāre, derivative of summa
Related formssum·less, adjectivesum·less·ness, nounout·sum, verb (used with object), out·summed, out·sum·ming.
Can be confusedsome sum (see usage note at some)

1. See number.

## SUM

surface-to-underwater missile.

## sum-

variant of sub- before m: summon.

## cogito, ergo sum

[koh-gi-toh er-goh soo m; English koj-i-toh ur-goh suhm, er-goh]

### Latin.

I think, therefore I am (stated by Descartes as the first principle in resolving universal doubt).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Examples from the Web for sum

### Historical Examples of sum

• When you solve a sum you go from "a" to "b" and from "b" to "c" and from "c" to "d" and so on.

Ancient Man

Hendrik Willem van Loon

• He gives his ambassador a sum on which a private gentleman can live, and no more.

• In Vienna, L. 11,000 a-year is equal to twice the sum in England.

• I know that you have double the sum we want in ready money—so I make no ceremony.

• But you, sir—will any sum—that is, any reasonable sum—be of use to you?

Night and Morning, Complete

Edward Bulwer-Lytton

British Dictionary definitions for sum

## sum

1

### noun

1. the result of the addition of numbers, quantities, objects, etc
2. the cardinality of the union of disjoint sets whose cardinalities are the given numbers
one or more columns or rows of numbers to be added, subtracted, multiplied, or divided
maths the limit of a series of sums of the first n terms of a converging infinite series as n tends to infinity
(plural) another name for number work
a quantity, esp of moneyhe borrows enormous sums
the essence or gist of a matter (esp in the phrases in sum, in sum and substance)
a less common word for summary
archaic the summit or maximum
(modifier) complete or final (esp in the phrase sum total)

### verb sums, summing or summed

(often foll by up) to add or form a total of (something)
(tr) to calculate the sum of (the terms in a sequence)

## Word Origin for sum

C13 summe, from Old French, from Latin summa the top, sum, from summus highest, from superus in a higher position; see super

## sum

2

### noun plural sumy (sʊmɪ)

the standard monetary unit of Uzbekistan, divided into 100 tiyin

## cogito, ergo sum

I think, therefore I am; the basis of Descartes' philosophy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sum
n.

late 13c., "quantity or amount of money," from Anglo-French and Old French summe (13c.), from Latin summa "total number, whole, essence, gist," noun use of fem. of summus "highest," from PIE *sup-mos-, from root *uper "over" (see super-).

The sense development from "highest" to "total number" is probably via the Roman custom of adding up a stack of figures from the bottom and writing the sum at the top, rather than at the bottom as we do now (cf. the bottom line). Meaning "total number of anything" is recorded from late 14c. Meaning "essence of a writing or speech" also is attested from late 14c. The verb is attested from c.1300; meaning "briefly state the substance of" (now usually with up) is first recorded 1620s. Sum-total is attested from late 14c., from Medieval Latin summa totalis.

Online Etymology Dictionary, © 2010 Douglas Harper

sum in Science

## sum

[sŭm]
The result of adding numbers or quantities. The sum of 6 and 9, for example, is 15, and the sum of 4x and 5x is 9x.