1. Make an addition
   "Let's add on to this" 
2. Add to the very end
   - append, supplement, affix

1. A component that is added to something to improve it
   - addition, improver 
2. A supplementary component that improves capability
   - accessory, appurtenance, supplement

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

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

Encyclopedia: Add-on

• chromatic color
• chromatic colour
• chromatic scale
• chromatic vision
• chromatically
• chromaticity
• chromatid
• chromatin
• chromatin granule
• chromatinic
• chromatism
• chromatogram
• chromatographic
• chromatographical
• chromatographically
• chromatography
• chromatography column
• chromatophore
• chrome
• chrome alum
• chrome green
• chrome red
• chrome yellow
• chrome-nickel steel
• chrome-tungsten steel