Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An accessory software program that extends the capabilities of an existing application.
  • adjective Computers Of or relating to a plug-in.
  • adjective Designed to be plugged in to an electric circuit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Designed to be plugged into an electrical power outlet or circuit.
  • noun computing A computer program module or device that interacts with another to add a specific function, or to support a specific file format or device.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the verb to plug in.

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