Definition of "dongle"
noun:
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Any small device which plugs into an electronic device, typically a computer, and alters its functionality. Common examples include wireless modems, software copy protect devices, and adapters. Some USB keyboards and mice include USB to PS/2 adapter dongles, enabling their use on machines with PS/2 ports.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A hardware device utilized by a specific application for purposes of copy protection.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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