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

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

But an addendum to that was that all support for the game, short of servers being shut off, was over. — Paul Tassi, Forbes.com, 7 July 2026

During discussions about elementary and middle school social studies curriculum, board members made addendums, including education about the horrors of communism, why the Second Amendment was created and how counterculture increased the rate of divorce. — Rachel Royster, Fort Worth Star-Telegram, 27 June 2026