Sum: meaning, definition, and synonyms

Sum is a flexible English word. It can mean the result of adding numbers, an amount of money, the whole total of something, or the main point of something. As a verb, it can also mean to add numbers or to give a brief summary.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Pronunciation

AI-generated pronunciation audio (OpenAI).

Accent: General American English

IPA: /səm/

Easy pronunciation: SUM (approximate spelling).

Stress: One syllable; stress is on the only syllable.

Noun meaning the result of adding numbers together.

Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Sum Meaning

the answer you get when you add numbers

Part of speech: noun

Definition: the result of adding numbers together

Example: The sum of 8 and 7 is 15.

Synonyms for this meaning:

total — A natural substitute when talking about a calculated result.
summation — Correct, but more formal and less common in everyday English.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Other Meanings of Sum

Meaning 2

an amount of money

Part of speech: noun

Definition: a quantity of money

Example: He borrowed a large sum of money.

Synonyms for this meaning:

amount — Works naturally when the money amount is not specified.
amount of money — Clear but more explanatory than idiomatic.
sum of money — A direct and natural phrase in this sense.

Meaning 3

the entire amount

Part of speech: noun

Definition: the whole amount or total of something

Example: In sum, the project cost more than expected.

Synonyms for this meaning:

aggregate — Works in formal or technical writing.
total — A common substitute when referring to the full amount.
totality — More formal and abstract than everyday use.

Meaning 4

the final total

Part of speech: noun

Definition: the final aggregate

Example: The sum of all our troubles did not equal the misery they suffered.

Synonyms for this meaning:

sum total — A close match when emphasizing the complete final total.
summation — Usually more formal and less common in everyday speech.

Meaning 5

to briefly state the main points

Part of speech: verb

Definition: be a summary of

Example: She summed up the report in two short sentences.

Synonyms for this meaning:

sum up — The most natural and common verb phrase for this sense.
summarise — Standard British English spelling.
summarize — Standard American English spelling.

Meaning 6

to add numbers together

Part of speech: verb

Definition: determine the sum of

Example: Please sum the figures for me.

Synonyms for this meaning:

add — The most general and common verb for this sense.
add together — Natural when the action of combining numbers is emphasized.
add up — Very common in everyday English.
sum up — Can mean adding numbers, but is also strongly associated with summarizing.
summate — Correct but formal and rare in general English.
tally — Can mean calculate the total, but is less direct than add.
tot — Informal and less common.
tot up — Common in British English for adding up amounts.
total — Natural when calculating a final number.
tote up — Informal and regional in use.

Meaning 7

a mathematical union of sets

Part of speech: noun

Definition: a set containing all and only the members of two or more given sets

Example: The union of the two sets contains all their elements.

Synonyms for this meaning:

union — The standard mathematical term for this sense.
join — Used in some technical contexts, but less standard than union.

Meaning 8

the main point or essence

Part of speech: noun

Definition: the choicest or most essential or most vital part of some idea or experience

Example: That short paragraph gets to the heart of the issue.

Synonyms for this meaning:

core — A strong substitute for the central part of an idea.
essence — A very good match for the most important part.
gist — Common and natural in this sense.
heart — Works well when referring to the central meaning.
kernel — Correct, but less common in everyday speech.
substance — A good fit when meaning the main substance of an argument or idea.

Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Sum Synonyms

Similar Meaning

total
summation

amount of money

amount
sum of money

whole amount or total

aggregate
total
totality

brief summary

sum up
summarise
summarize

add numbers together

add
add up
add together
tot up
total

mathematical union of sets

union

main point or essence

core
essence
gist
heart
substance

Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Common Mistakes

Do not confuse sum as a noun meaning a total with sum up, which is often a verb meaning to summarize.
Do not treat union as a general synonym for sum; it only fits the set-theory sense.
Do not use sum of money for the mathematical sense.
Total can be a synonym in several senses, but the exact meaning depends on context.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.

Frequently Asked Questions

What does sum mean in math?

In math, sum means the result you get when you add numbers together.

What does sum mean as a noun?

As a noun, sum can mean a total, an amount of money, or the main point of something, depending on context.

What does sum up mean?

Sum up usually means to give a short summary of the main points.

Is sum the same as total?

Often, yes. Total can be a synonym for sum in several senses, especially when you mean the final amount.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-21. AI assessment; not a guarantee of accuracy.