Definitions from Wiktionary (add-on)

▸ noun:  (sometimes attributive) Something which can be appended to something else.
▸ noun:  (computer hardware, software) A software extension or hardware peripheral that provides additional functions or customization for a core application or system.
▸ noun:  (poker) Additional chips that can be purchased at specific times in tournament play.
▸ noun:  (video games) Synonym of expansion pack
▸ Also see add-on

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