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

  • n. One thing added as a supplement to another.
  • n. Computer Science See add-in.
  • n. Computer Science A hardware device, such as an expansion card, that is added to a computer to increase its capabilities.
  • n. An additional amount or charge.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Something which can be appended to something else.
  • n. A software extension or hardware peripheral that provides additional functions or customization for a core application or system.

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

  • n. a component that is added to something to improve it
  • n. a supplementary component that improves capability


from Wiktionary, Creative Commons Attribution/Share-Alike License

add + on


  • Travelers who choose an add-on, which is tacked on to existing domestic calling and data plans, now get 50 MB for $25 a month compared with 20 MB previously, and up to 800 MB for $200 a month versus 200 MB.

    NYT > Home Page

  • We are preparing a system for micro-transactions and so-called add-on content for both the Nintendo 3DS and the Wii U, and for the Nintendo 3DS we are targeting to release something this calendar year.

    Wired Top Stories

  • The upgrade costs for NFC range from $100 to $850 per terminal, compared with an add-on device to support Zoosh that will cost merchants about $30, Naratte estimates.

    Stepping Up Smartphone Checkouts

  • Yes: that Chauncey, the asterisk of the Carmelo Anthony deal, the add-on, the roadie, the attaché, the complimentary dessert.

    Knicks' Billups for Best Supporting Actor

  • Complying with the system's regulations costs every defense contractor extra time, labor and mountains of paperwork—all of which gets passed onto the taxpayer thanks to the standard cost-plus contract that the Pentagon issues, which reimburses contractors for allowed expenses with an add-on fee as profit.

    The Silver Lining to Defense Budget Cuts

  • Would investors really have listened to two 25-year-old grad students with no startup experience, no revenue model, no tested management team in place, for an app that was perceived to be a secondary add-on, in a field that was already crowded with well-funded incumbents?

    John F. Ince: Where Are the Investors Who Will Back the Googles of Tomorrow?

  • It's a really great deal with a value of over $300 for just $169 (plus the $50 if you want the scrapbooking add-on) and FREE shipping ....

    Back in the game again

  • PLUS all the business supplies and an optional add-on for scrapbookers of the following for $50:

    Back in the game again

  • I have used Natal, and while it is quite innovative, i dont see it being used for much other than minigames and wii-sports esque games without some sort of add-on peripheral.

    EXTRALIFE – By Scott Johnson - Some hands on with Project Natal

  • Dumuzi's Dream is, as I understand, an add-on to Inanna's Descent, the two sutured together.

    A Theory of Modes and Modalities


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