Dictionary

1add–on

noun \ˈad-ˌän, -ˌn\

: an extra part or device that can be added to something else to improve it

Full Definition of ADD-ON

:  something added on: as
a :  a sum or amount added on
b :  something (as an accessory or added feature) that enhances the thing it is added to <computer hardware add–ons>

First Known Use of ADD-ON

1941

2add–on

adjective

Definition of ADD-ON

1
:  being or able to be added on <an add–on device>
2
:  able to be added to <add–on certificates of deposit>

First Known Use of ADD-ON

1955

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