addendum

noun

ə-ˈden-dəm How to pronounce addendum (audio)
Definition of addendumnext
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

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2
as in increase
something added (as by growth) with each new addendum the list of demands simply got more absurd

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 See All Example Sentences for addendum
Recent Examples of Synonyms for addendum
  1. appendix
  2. increase
  3. addition
  4. boost
  5. gain
Noun
  • Not because a new appendix deserves a barnstorming tour, or because county unemployment data has suddenly become beach reading.
    — Andrew Leahey, Forbes.com, 29 June 2026
  • The employment agreement includes an appendix that releases the university from all claims for incidents or events prior to the contract’s effective date.
    — Daniel Libit, Sportico.com, 27 June 2026
Definition of appendix
Noun
  • Hispanics or Latinos were the target of the biggest increase in racially or ethnically motivated hate crimes, according to the report.
    — Jazmin Alvarado, Los Angeles Times, 3 July 2026
  • However, the report noted that much of this rise was due to an increase in the number of billionaires, not just three-comma club members getting richer.
    — Hayley Cuccinello, CNBC, 2 July 2026
Definition of increase
Noun
  • Wade is the first free-agent addition to the Sixers since Mike Gansey replaced Daryl Morey as the team's new president of basketball operations.
    — Tom Ignudo, CBS News, 1 July 2026
  • Its newest addition—part of hotelier Ian Schrager’s Edition chain—is a decidedly more subdued affair, and that’s by design.
    — Condé Nast, Condé Nast Traveler, 1 July 2026
Definition of addition
Noun
  • Local business owners welcomed the boost in business as Dodgers fans filled restaurants, hotels and entertainment districts throughout Sacramento and West Sacramento.
    — Reeti Malhotra, Sacbee.com, 1 July 2026
  • But while the sportswear giant remains the category leader by revenue, and the company is enjoying a FIFA World Cup boost for its soccer jersey sales, the momentum has shifted decisively away from Beaverton, Oregon.
    — Mark Faithfull, Forbes.com, 1 July 2026
Definition of boost
Noun
  • Christine Lagarde, president of the European Central Bank, said AI is a source of productivity and gains.
    — Hugh Leask, CNBC, 3 July 2026
  • Saturated fats can also cause weight gain, affect metabolic health and increase the risk of developing diabetes, heart disease and other health issues, according to the National Library of Medicine.
    — Mary Kekatos, ABC News, 3 July 2026
Definition of gain

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addenda
addendum
adder
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Cite this Entry

“Addendum.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/addendum. Accessed 7 Jul. 2026.

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More from Merriam-Webster on addendum

Nglish: Translation of addendum for Spanish Speakers

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