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

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Synonyms & Antonyms for addendum



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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
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Recent Examples on the Web Cordileone, in an addendum to his pastoral letter, sought to explain its timing. David Crary, ajc, 10 May 2021 However, with the addendum to the existing contract, the amount will rise to 7.25 percent in the last year of that contract. Bob Sandrick, cleveland, 27 Apr. 2021 The California Department of Public Health recently issued an addendum to its Blueprint for a Safer Economy. Michael Hollan, Fox News, 22 Apr. 2021 In addition to acting on the lease option Tuesday, port commissioners also approved an addendum to a 2014 environmental impact for a Sunroad hotel project and the east Harbor Island area. San Diego Union-Tribune, 13 Apr. 2021 Newer board members defended Magyar’s performance and approval of the new contract and addendum. Bob Sandrick, cleveland, 27 Apr. 2021 Trustee Dawn Abernathy was the lone vote against the addendum. James T. Norman,, 24 Mar. 2021 Tinkle had two years remaining on his contract and received an automatic one-year addendum for making the field. John Canzano, oregonlive, 2 Apr. 2021 Any objective case about bitcoin’s energy usage must necessarily feature an addendum that puts such consumption in context and lists the broader benefits of the asset. Lawrence Wintermeyer, Forbes, 10 Mar. 2021

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.

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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"

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Time Traveler for addendum

Time Traveler

The first known use of addendum was in 1664

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Statistics for addendum

Last Updated

24 May 2021

Cite this Entry

“Addendum.” Dictionary, Merriam-Webster, Accessed 13 Jun. 2021.

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More Definitions for addendum



English Language Learners Definition of addendum

: something that is added especially : a section of a book that is added to the main or original text


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)


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