Addenda

Part of speech: noun

Pronunciation: /əˈdɛn.də/

Definitions

1. A collection of supplementary material or items added to a book, document, or report to provide further information or updates
2. Additional content that enhances or clarifies the original text, often presented as an appendix or attachment
3. Items or notes that serve as an extension to existing material, typically included to elaborate on a subject or correct omissions

Etymology: "Addenda" is the plural of "addendum", and the grammar points straight back to Latin. The Latin "addendum" is the neuter form of a future passive participle meaning "that which is to be added", built from "addere", "to add" (ad, "to", plus dare, "to put"). So the word has always carried the sense of something that must be attached to a larger whole. English took "addendum" directly from Latin as a learned borrowing, keeping its original Latin plural "addenda" alongside the anglicised option. The Latin plural form is the one most people encounter, and it means the supplementary items gathered at the end of a book, report or document, such as appendices, corrections or extra notes. The word therefore describes material that was always meant to follow the main text rather than sit inside it.

Synonyms: supplements, appendices, attachments, additions, incidents