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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.

With Mejia’s addition, Democrats will have 214 representatives, while Republicans have 217, and one independent caucuses with the GOP.

From Salon • Apr. 18, 2026

Sandy said her husband had phoned her up on Monday, "ever so excited" and revealed they had a new addition at the farm in the form of the peacock.

From BBC • Apr. 17, 2026

In addition, each qubit can influence others, allowing a relatively small number of qubits to represent an enormous number of possible states.

From Science Daily • Apr. 17, 2026

In addition to his World Series Game 7 heroics, Anderson batted .300 with four doubles, two home runs and 13 RBIs during the 2002 postseason.

From Los Angeles Times • Apr. 17, 2026

Then, after a while, in addition to “why,” I also started asking “why not” so that I could get to the root of the question.

From "Reaching for the Moon" by Katherine Johnson

Vocabulary lists containing addition

Arithmetic

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List 1

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The Number System

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