Definitions
1.verbTo incorporate (something extra, often an amount of money) into something else (often a bill).
2.verbTo put an expansion onto a building, usually a home.
3.noun(sometimes attributive) Something which can be appended to something else.
4.nounA software extension or hardware peripheral that provides additional functions or customization for a core application or system.
5.nounAdditional chips that can be purchased at specific times in tournament play.