# addendum

> English word · Noun · IPA /əˈdɛn.dəm/ · frequency rank #33,106

## Definitions
1. Something to be added; especially text added as an appendix or supplement to a document.
2. A postscript.
3. The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.

## Etymology
From the gerundive of Latin addere (“to add”).

## Common misspellings (10)
`addednum`, `addenddum`, `addendmu`, `addendumm`, `addenndum`, `addenudm`, `addnedum`, `adedndum`, `adendum`, `dadendum`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/addendum