add-on - definition and synonyms

noun [countable] 

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singularadd-on
pluraladd-ons
  1. something that is added to something else

    I just want the basic blender, with no add-ons.

    1. a.

      add-on

      or

      add-in

      computing a computer program or a piece of computer equipment that you can add to a computer in order to increase the number of things it is able to do