Synonyms of addition

addition

noun

ə-ˈdi-shən 

1

as in extension

a smaller structure added to a main building

a new addition to the library providing space for an expanded video collection

Synonyms & Similar Words

• extension
• annex
• wing
• arm
• penthouse
• ell

2

as in increase

something added (as by growth)

the cache of old stamps I found in the discarded desk was a huge addition to my stamp collection

Synonyms & Similar Words

• increase
• boost
• gain
• rise
• raise
• plus
• increment
• augmentation
• expansion
• supplement
• proliferation
• addendum
• accrual
• more
• accretion
• step-up
• accumulation
• continuation
• uptick
• complement
• collection
• extension
• gathering
• appendix
• spike
• jump
• assemblage
• upturn
• accession
• run-up
• uptrend

Antonyms & Near Antonyms

• reduction
• decrease
• loss
• lowering
• diminution
• depletion
• lessening
• decline
• fall
• shrinkage
• abatement
• decrement
• subtraction
• diminishment
• deduction
• step-down
• falloff
• drop-off

3

as in accumulating

the act or process of becoming greater in number

how do you account for the addition of more paint stains on your shirt after you put on a smock?

Synonyms & Similar Words

• increase
• accumulating
• accumulation
• multiplication
• proliferation
• doubling
• mushrooming
• expansion
• growth
• rise
• augmentation
• escalation
• enlargement
• extension
• quadrupling
• tripling
• creep
• cumulation
• lengthening
• amplification
• increment
• inflation
• spread
• accrual
• accretion
• distension
• gain
• boost
• hike

Antonyms & Near Antonyms

• decrease
• reduction
• lowering
• diminution
• diminishing
• contracting
• drop
• lessening
• contraction
• compression
• fall
• shrinkage
• abatement
• condensation
• constriction
• shrinking
• condensing
• diminishment
• shortening
• retrenchment
• compressing
• falloff
• drop-off
• constricting
• retrenching

Example Sentences

Recent Examples of addition

New yellows move between musky and citrusy, while additions to the cooler end of the spectrum include restorative greens, meditative blues and purples ranging from dusky to glamorous. — Alexandra Harrell, Footwear News, 16 Sep. 2026

The video is the a sparkly addition to Sesame Street‘s Parody Party, a seven-song collection of kid-friendly takes on some of pop’s biggest recent hits. — Alicia Urrea, Billboard, 16 Sep. 2026

Ahead of the season-52 premiere on September 26, the Saturday Night Live cast got some new additions. — Hershal Pandya, Vulture, 16 Sep. 2026

Veterans Lars Eller and Garnet Hathaway are new additions to the room who should fit fourth-line roles with Sandis Vilmanis, Cole Reinhardt, Cole Schwindt and Jonah Gadjovich also in the mix for playing time. — Jordan McPherson, Miami Herald, 16 Sep. 2026

Phrases Containing addition

• in addition to