addendum

noun

ad·​den·​dum ə-ˈden-dəm 

plural addenda ə-ˈden-də  also addendums

1

: a thing added : addition

2

: a supplement to a book

—often used in plural but singular in construction

Synonyms

• afterword
• appendix
• codicil
• excursus
• supplement

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

Instead, it was set up as an addendum to an existing contract between Accenture and the University of Virginia — one that allowed any other state, city, county or higher education institution in the country to join. —Sam Janesch, Baltimore Sun, 19 Nov. 2024

Create or update a central repository for all payer contracts, including amendments, addendums and updates. —Chandler Barron, Forbes, 14 Oct. 2024

Hoback contends that the reply actually reads more like someone finishing their previous thought — that Todd had signed into the wrong account to make an addendum to the original Nakamoto post. —Whizy Kim, Vox, 7 Dec. 2018

Call this an addendum to Monday’s newsletter on the fickle nature of immigration politics: New border apprehension numbers are out, and two of our columnists have wildly different takes on them. —Joanna Allhands, The Arizona Republic, 8 Oct. 2024

Word History

Etymology

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

First Known Use

1664, in the meaning defined at sense 1

Kids Definition

addendum

noun

ad·​den·​dum ə-ˈden-dəm 

plural addenda -ˈden-də 

: something added (as to a book)