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

What remains is a far more interesting addition to the rape-revenge tradition, albeit one that may frustrate viewers expecting more conventional genre thrills from a Fantasia premiere. — Alison Foreman, IndieWire, 22 July 2026

Also returning for the new film are favorites Leonardo Nam, Rita Ora, Brandy, Melanie Paxson and Paolo Montalban, with new additions Liamani Segura, Brendon Tremblay, Alexandro Byrd, Kiara Romero and Awkwafina. — Brenton Blanchet, PEOPLE, 22 July 2026

One of this year’s biggest additions is Friday’s Rock the Bridge event at Rock Island Bridge. — Kansas City Star, 22 July 2026

On Tuesday, the agency made further additions, adding a handful of temporary voting members, largely from academic institutions who were designated as having expertise in specific peptides. — Will Stone, NPR, 22 July 2026

Phrases Containing addition

• in addition to