Dictionaryplug-inPronunciation: (plug'in"), [key] —adj. capable of or designed for being connected to an electrical power source by plugging in or inserting: a plug-in hair dryer; a plug-in transistor. —n. 1. plug (def. 3). 2. jack1 (def. 3). 3. a plug-in appliance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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