ad·​den·​dum | \ ə-ˈden-dəm How to pronounce addendum (audio) \
plural addenda\ ə-​ˈden-​də How to pronounce addendum (audio) \ also addendums

Definition of addendum

1 : a thing added : addition
2 : a supplement to a book often used in plural but singular in construction

Synonyms & Antonyms for addendum



Visit the Thesaurus for More 

Examples of addendum in a Sentence

Francine du Plessix Gray, in an essay first written in 1991 and updated with an addendum here, writes eloquently of a lifelong obsession with weight loss, stemming from the harsh judgments of a mother enraptured by fashion. — Ginia Bellafante, New York Times Book Review, 21 Sept. 2008 This qualification, however, is not a recent addendum to Derrida's career. In 1990, near the end of the period in which rhetoric and composition had a strong interest in his work, Derrida participated in an editor's interview … in which he characterized his project as fundamentally tied to the tradition it works both within and against. College English, September 2006 The letters are included as an addendum to the biography. there's an addendum from the author to explain certain stylistic choices that she made
Recent Examples on the Web Westport is drafting its own plan, although the Planning and Development Commission plans to use the WestCOG research and attach the plan as an addendum, commissioner Danielle Dobin said. Ginny Monk, Hartford Courant, 20 Apr. 2022 As an addendum, there is an interesting tension with the place of classical music in the United States. Isaac Chotiner, The New Yorker, 17 Mar. 2022 The songs, written by Williams, are not always an addendum to life or a feat of imaginative extrapolation. K. Austin Collins, Rolling Stone, 15 June 2022 But as climate change accelerates, those woes could spread to other states: an unwelcome addendum to increased risk of disasters like floods and wildfires. Time, 2 June 2022 The Public Lands Department will seek approval of an official addendum to the plan before moving forward. Blake Apgar, The Salt Lake Tribune, 14 June 2022 As an addendum to the note last week about how many times Willie Mays played at Fenway Park, Ken Avery e-mailed to mention that Mays also played an exhibition game at Fenway on June 25, 1952, to benefit wounded servicemen. Peter Abraham,, 14 May 2022 In June 2021, the department sent an addendum to the bid specifications for mathematics textbooks to these publishers. Kiara Alfonseca, ABC News, 22 Apr. 2022 This addendum by Patricia Gandara at UCLA, one of the authors of the faculty senate report, who felt that the report’s conclusions were being misportrayed and misinterpreted. Zachary B. Wolf, CNN, 9 Apr. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'addendum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of addendum

1664, in the meaning defined at sense 1

History and Etymology for addendum

borrowed from Latin, neuter of addendus, gerundive of addere "to add"

Learn More About addendum

Time Traveler for addendum

Time Traveler

The first known use of addendum was in 1664

See more words from the same year

Dictionary Entries Near addendum



addendum circle

See More Nearby Entries 

Statistics for addendum

Last Updated

11 Jul 2022

Cite this Entry

“Addendum.” Dictionary, Merriam-Webster, Accessed 12 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for addendum


ad·​den·​dum | \ ə-ˈden-dəm How to pronounce addendum (audio) \
plural addenda\ ə-​ˈden-​də \

Kids Definition of addendum

: something added (as to a book)

More from Merriam-Webster on addendum

Nglish: Translation of addendum for Spanish Speakers

Britannica English: Translation of addendum for Arabic Speakers


Test Your Vocabulary

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!