plural addenda
-ˈdɛndə 
or addendums
or addendums
: something that is added
especially
: a section of a book that is added to the main or original text
The letters are included as an addendum to the biography.
Cite this Entry
“Addendum.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/addendum. Accessed 16 Apr. 2026.
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