Definition of addendum in English:

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Pronunciation: /əˈdɛndəm/

noun (plural addenda /əˈdɛndə/)

1An item of additional material added at the end of a book or other publication.
Example sentences
  • 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.
appendix, codicil, postscript, afterword, tailpiece, rider, coda, supplement, accompaniment;
adjunct, appendage, addition, add-on, attachment, extension
rare postlude, subscript, allonge
2 Engineering The radial distance from the pitch circle of a cogwheel or wormwheel to the crests of the teeth or ridges. Compare with dedendum.


Late 17th century: Latin, 'that which is to be added', gerundive of addere (see add).

Words that rhyme with addendum

corrigendum, referendum

For editors and proofreaders

Line breaks: ad¦den|dum

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