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English definition of “plug-in”

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plug-in

noun [C] ( also plugin)
 
 
/ˈplʌɡɪn/
IT a small computer program that makes a larger one work faster or have more features: The company charges $50 extra for the optional plug-in. Users simply download a small plugin that works with their browsers.
(Definition of plug-in noun from the Cambridge Business English Dictionary © Cambridge University Press)
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