bolt-on

Noun

 * 1)  An accessory that can be bolted on or otherwise attached.
 * 2)  A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).
 * 1)  A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).
 * 1)  A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).
 * 1)  A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).
 * 1)  A functionality or service that can be added to an existing arrangement or plan (for example, a mobile telephone subscription).

Adjective

 * 1) Of an accessory: capable of being bolted on or otherwise attached.
 * 2)  Used to extend an existing system, operating as an add-on or plug-in.
 * 1)  Used to extend an existing system, operating as an add-on or plug-in.
 * 1)  Used to extend an existing system, operating as an add-on or plug-in.
 * 1)  Used to extend an existing system, operating as an add-on or plug-in.