Definitions of plug-in:
- adjective: Designed to be plugged into an electrical power outlet or circuit.
- adjective: Able to be extended with further components in a modular fashion.
- noun: Anything that plugs into something.
- noun: (computing) A module or device that interacts with another to add a specific feature or function.
- noun: An electric vehicle that can be recharged from an external power source.
(Definitions from Wiktionary)
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