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

The horrifying addendum was that her two-year-old son was the only witness to the crime, and had to draw on limited memory and communication skills to try and convey details about the murderer, who was, in fact, caught and convicted 16 years later. — Paul Tassi, Forbes.com, 9 June 2026

An addendum to team agreements outlines 14 highly specific marketing requirements—far more prescriptive than the general promotional language typically found in college sports event contracts. — Daniel Libit, Sportico.com, 20 Mar. 2026

One day later, the DOJ revealed an addendum to the settlement that effectively shielded the plaintiffs and certain affiliates from any IRS enforcement regarding their past tax returns. — Kevin Breuninger, CNBC, 27 May 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