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Noun: add-on  'ad,ón
  1. A component that is added to something to improve it
    "the add-on of a bathroom was a major improvement";
    - addition, improver
  2. A supplementary component that improves capability
    - accessory, appurtenance, supplement, bolt-on
Verb: add on
  1. Make an addition
    "Let's add on to this"
  2. Add to the very end
    "He added on a glossary to his novel where he used an invented language";
    - append, supplement, affix

Derived forms: added on, adds on, adding on, add-ons

Type of: add, attach, component, constituent, element

Encyclopedia: Add-on