Synonyms of addendum

addendum

noun

ə-ˈden-dəm 

1

as in appendix

a part added at the end of a book or periodical

there's an addendum from the author to explain certain stylistic choices that she made

Synonyms & Similar Words

• appendix
• codicil
• afterword
• supplement
• epilogue
• documentation
• conclusion
• addition
• postscript
• coda
• sequel
• excursus
• accompaniment
• finale
• ending
• follow-up
• complement
• postlude
• rider
• allonge

Antonyms & Near Antonyms

• introduction
• preface
• foreword
• prologue

2

as in increase

something added (as by growth)

with each new addendum the list of demands simply got more absurd

Synonyms & Similar Words

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

Antonyms & Near Antonyms

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

Example Sentences

Recent Examples of addendum

An addendum was released earlier this year focused on parks and schools to determine whether pesticides were reaching public spaces. — Christiana Freitag, Chicago Tribune, 16 Aug. 2026

Developers are arguing that an environmental impact report is unnecessary because of an outdated assessment from 2002 and an addendum from 2012. — Veronica Eady, Mercury News, 14 Aug. 2026

In a company addendum to the report, which did not identify its author, Blackbird appeared to rebut those questions. — Andrew Graham, Sacbee.com, 10 Aug. 2026

Review your vehicle sales paperwork Check the purchase agreement, dealer addendum, finance documents and service records. — Kurt Knutsson, FOXNews.com, 31 July 2026