Addendum

Part of speech: noun

Pronunciation: /əˈdɛn.dəm/

Definitions

1. A section added at the end of a book or document to provide supplementary information or corrections that were not included in the main text
2. A supplementary document or section included to enhance, clarify, or rectify the information presented in the primary text
3. An attachment or addition meant to provide extra details or make amendments to an original document or text

Etymology: The Latin verb "addere" meant "to add," and its future passive participle, "addendum," literally meant "something that is to be added." Roman writers used the neuter form for the thing being attached, so the word began as a plain instruction in grammar: this must be annexed. English borrowed it directly from Latin as a learned term, so it arrived with its Latin shape intact rather than being worn down by everyday speech. The word's core idea is still visible in its parts. The prefix "ad-" means "to" or "toward," and the root "dare" or "dere" sense of putting or giving is buried in the verb "addere" as a compound of "ad" and "dare." Each element points in the same direction, toward attaching one thing to another.

Synonyms: supplement, appendix, attachment, addition, postscript