Definition of addendum in English:
noun (plural addenda /-də/)
1An item of additional material added at the end of a book or other publication.
- The cover has changed, the map of Egypt is missing, and additions and corrections have been placed as an addendum on page 205 instead of directly in the text.
- For the articles that appeared in the earlier edition, addenda include the new data that is available; only a handful of the original articles were rewritten.
- He welcomes any professional updates or addenda to his primer.