Definition: The addition of an additional item or detail to an original document, quotation, or other source. In the context of legal documents, an addendum can be used as a supplement to the original document, providing information not previously included in it. It could also refer to a supplementary report, statement, or other material added by an individual or organization after the original document has been completed but before publication. The definition of "addendum" can vary depending on the context and source, but generally refers to any additional information that is not included in the main body of the document. The addendum could be written within a note or as part of a larger legal document, such as an annex or appendix. It is usually signed by both parties involved in the dispute or conflict. In summary, an addendum is an extension or addition to an original document, quotation, or other source, often used to provide additional information not previously included and added by another person after the main content of the document has been completed but before it was published.