- an amount of money: a
*sum*paid in reparation - the whole amount; totality; aggregate: the
*sum*of our experience - the gist or a summary of something said, done, etc.: usually in sum and substance
- the result obtained by adding numbers or quantities; total
- Old-fashioned a series of numbers to be added together, or any problem in arithmetic
- the limit of the sum of the first
*n*terms of an infinite series as*n*grows indefinitely - the set containing every element belonging to one or both of two original sets and no other elements
- in Boolean algebra, disjunction (sense )

- Archaic the highest degree; height; summit

Origin of sum

Middle English*somme*from Middle French from Classical Latin

*summa,*feminine of

*summus,*highest, superlative from base of

*super:*see super-

transitive verb

summed, sum′ming- to determine the sum of by adding
- to summarize or review briefly; sum up

**sum Idioms**

in sum

sum up

- to add up or collect into a whole or total
- to review briefly; summarize