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

Heart of the Beast was one of the late additions to this year’s San Sebastián lineup. — Zac Ntim, Deadline, 23 Sep. 2026

Scarlett Johansson has joined the franchise as a new addition, alongside fellow Marvel alum Sebastian Stan. — Mckinley Franklin, HollywoodReporter, 23 Sep. 2026

But the outlook for the Knights changed drastically when their top transfer portal addition quarterback Alonza Barnett injured his hamstring. — Steven Johnson, Fort Worth Star-Telegram, 22 Sep. 2026

The unexpected addition gave the song, which was already written as a tribute to Horan’s late One Direction bandmate, a very poignant ending. — Alicia Urrea, Billboard, 22 Sep. 2026

Phrases Containing addition

• in addition to