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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.

Billionaire Citadel founder and CEO Ken Griffin has reportedly expanded his enormous international property portfolio with the addition of a $38 million duplex apartment inside a storied New York City apartment building.

From MarketWatch • Apr. 22, 2026

In addition, a number of players are understood to be unconvinced by the 41-year-old, who moved to Chelsea from their French partner club Strasbourg just over three months ago.

From BBC • Apr. 22, 2026

Lam, who became president this month in addition to Communist Party boss, is pushing a "new growth model" that prioritises digital and technological innovation as Vietnam aims to escape the "middle-income trap".

From Barron's • Apr. 22, 2026

Tickets will be available across categories one through three in addition to the front-row seat categories, depending on the match.

From Los Angeles Times • Apr. 21, 2026

In addition to being a fascinating tale designed to catch your attention, it introduces themes that reverberate throughout all the stories that follow by serving as the exception that proves the rule.

From "Founding Brothers: The Revolutionary Generation" by Joseph J. Ellis

Vocabulary lists containing addition

Arithmetic

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List 1

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The Number System

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