# add-on

> English word · Noun

## Definitions
1. Something which can be appended to something else.
2. A software extension or hardware peripheral that provides additional functions or customization for a core application or system.
3. Additional chips that can be purchased at specific times in tournament play.
4. Synonym of expansion pack.

## Etymology
Deverbal from add on.

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