Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Something designed or intended for use in conjunction with another.
  • n. An accessory software program that extends the capabilities of an existing application. Also called add-on, plug-in.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A plug-in.

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

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

Etymologies

add +‎ in (Wiktionary)

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