Addendum - Definition, Meaning & Synonyms

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SKIP TO CONTENT addendum /əˈdɛndəm/ /əˈdɛndəm/ IPA guide

Other forms: addenda; addendums

When you make an addendum to a document, you are adding text to the end. Addenda tend to be serious business as they're added to contracts, reports, and studies.

There is nothing dumb about an addendum; often an addendum makes a document "smarter" by adding more information. If you did a science report on plant growth and found that after your study was complete, the plant flowered in an unusual way, you might describe that as an addendum to your report. Fun fact: the plural of addendum is addenda.

Definitions of addendum

noun textual matter that is added onto a publication; usually at the end synonyms: postscript, supplement see moresee less types: show 4 types... hide 4 types... appendix supplementary material that is collected and appended at the back of a book continuation, sequel a part added to a book or play that continues and extends it shirttail a brief addendum at the end of a newspaper article codicil a supplement to a will; a testamentary instrument intended to alter an already executed will type of: matter written works (especially in books or magazines)
noun a thing that is added or will be added see moresee less type of: add-on, addition, improver a component that is added to something to improve it

Pronunciation US /əˈdɛndəm/ UK /əˈdɛndəm/ Cite this entry Style: MLA

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Copy citation DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘addendum'. Views expressed in the examples do not represent the opinion of Vocabulary.com or its editors. Send us feedback Word Family

Vocabulary lists containing addendum

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Vocabulary.com and the New York Times Learning Network have teamed up to launch a Vocabulary Video contest. Just create a short (15 seconds or less) video that defines or teaches any of the words in the Times' Word of the Day collection, post it online, and submit a link to your video in the Learning Network's comments section. Click on these links to learn more about the eligible words: List 1, List 2 and List 3.

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