Etymology
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plug-in (adj.)

"designed to be plugged into a socket," 1922, from the verbal phrase, from plug (v.) + in (adv.).

updated on July 15, 2020

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Definitions of plug-in from WordNet

plug-in (n.)
a software module that extends or enhances the capabilities of an existing application;
Synonyms: add-on
plug-in (n.)
a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities;
Synonyms: circuit board / circuit card / board / card / add-in
From wordnet.princeton.edu, not affiliated with etymonline.