Definition of "addon" []

• Something to expand something else (noun)

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• "| Reply the HD-DVD addon is also globally recognized as an awful way to enter the high definition market, whereas, the playstation 3 is not."
• "We, TidyRead, got a confirmation from mozilla: "Congratulations, your addon has been approved for public status.", that means TidyRead is approved by mozilla and is out of experimental status."
• "The main feature of the addon is the search functionality that allows all users to search their alts 'bags or loot tables in an Auction-House-like frame."