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

Renovations are underway in multiple theater venues, including the addition of Dolby Sound. — Anne Thompson, IndieWire, 29 July 2026

The newest addition to San Leon’s coastal dining scene is Pier 6 Seafood & Oyster House, which blends polished hospitality with deep local roots. — Gabi De La Rosa, Southern Living, 29 July 2026

Engineers carried out the integration over several months at multiple locations using AeroVironment’s autonomy interface control document, which is intended to simplify the addition of third-party software. — Aamir Khollam, Interesting Engineering, 29 July 2026

Canales wondered aloud whether the addition of Trask gives him more options at QB considering the four-game preseason load. — Alex Zietlow, Charlotte Observer, 29 July 2026

Phrases Containing addition

• in addition to