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  1. add-on
  2. noun

    • 1. something that has been or can be added to an existing object or arrangement:

      cars with add-on extras we offer skiing lessons as add-ons to our chalet vacations
    • 2. an accessory device or piece of software designed to increase the capability of a computer or hi-fi system:

      now you can get the incredible sound of compact disc without getting an add-on amplifier
    • 3. a unit of construction added to an existing construction:

      the new kitchen replaces an add-on that was torn down in 1980
  3. Variation

    • n.: noun: add-on, plural noun: add-ons