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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.

Sandisk stock rises after Nasdaq announced its addition to the Nasdaq 100 index.

From Barron's • Apr. 13, 2026

Participants in the trial received an injection of the experimental drug zilebesiran in addition to their existing blood pressure treatments.

From Science Daily • Apr. 13, 2026

Replacing four buildings with a single structure that boasts over 100,000 square feet of space, the addition will play host to the museum’s permanent collection.

From The Wall Street Journal • Apr. 12, 2026

In addition to his nephews, Nolan is survived by his wife, actor Kim Hartman; and their children Miranda and Tom; as well as his grandchildren Dylan and Kara.

From Los Angeles Times • Apr. 12, 2026

In addition to the title, this page added the name of the author: S. H. Elives.

From "Jeremy Thatcher, Dragon Hatcher" by Bruce Coville

Vocabulary lists containing addition

Arithmetic

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List 1

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The Number System

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