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

Advertisement Blanche defended the tax term, which had been included in an addendum to the DOJ’s announcement of the fund and not separately announced. — Miranda Jeyaretnam, Time, 3 June 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

Yet the addendum makes DeVaux a little weary. — Dana O’Neil, CNN Money, 9 May 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