add–on
/ˈædˌɑːn/
noun
plural
add–ons
plural
add–ons
Britannica Dictionary definition of ADD–ON
[count]
:
an extra part or device that can be added to something else to improve it
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He has all the latest add-ons for his computer.
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I knew the base price for the car, but with the add-ons I wanted, the final price was quite a bit higher.
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often used before another noun
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add-on components
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add-on equipment