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Definitions

addition

[uh-dish-uhn] / əˈdɪʃ ən /
NOUN
process of conjoining, adding
Synonyms
STRONGEST
extension inclusion
STRONG
accession annexation attachment augmentation enlargement
WEAK
adding adjoining affixing increasing
Antonyms
STRONG
decrease
WEAK
deduction lessening loss reduction shrinkage subtraction withdrawal
NOUN
something conjoined to or enlargement of something
Synonyms
STRONGEST
bonus boost enhancement expansion extension supplement
STRONG
accession accessory accretion accrual addendum additive adjunct aggrandizement annex appendage appendix attachment augmentation commission dividend enlargement extra gain hike increase increment markup option profit raise reinforcement rise wing
Antonyms
STRONGEST
decrease
STRONG
decline drop fall lessening loss reduction shrinkage subtraction
WEAK
deduction withdrawal
NOUN
arithmetical process of augmentation
Synonyms
STRONG
accretion computing counting reckoning summation
WEAK
accruing adding enlarging expanding increasing summing tabulating totaling toting
Antonyms
WEAK
decrease deduction lessening loss reduction shrinkage subtraction withdrawal

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That is because in addition to being one of the industry’s most-aggressive coders—as Wall Street Journal reporting has shown—the company also delivers medical care through its Optum Health division.

From The Wall Street Journal • Apr. 17, 2026

In addition, the results suggest that parts of Doggerland persisted through major flooding events, including the Storegga tsunami about 8,150 years ago, with some areas remaining above water until roughly 7,000 years ago.

From Science Daily • Apr. 17, 2026

In addition, the long-held agreement with Saudi Arabia to recycle oil petrodollar surpluses into U.S.

From MarketWatch • Apr. 17, 2026

Anita told BBC Scotland News she was "still buzzing" from the encounter, while it also gave her a financial boost as Amos purchased items for her touring crew and family members in addition to herself.

From BBC • Apr. 17, 2026

In addition to his customary thick glasses, he wore a handkerchief tied ’round his nose and mouth, like a bandit.

From "The Interrupted Tale" by Maryrose Wood

Vocabulary lists containing addition

Arithmetic

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List 1

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The Number System

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