Etymology
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dongle (n.)

small device made to connect to a computer, now especially for use of wireless broadband or protected software, by 1982, perhaps 1980, perhaps suggested by dangle and dong (n.).

updated on September 28, 2018

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Definitions of dongle from WordNet

dongle (n.)
(computer science) an electronic device that must be attached to a computer in order for it to use protected software;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.