- a device or unit added to equipment or a construction: an add-on to a computer; a nice add-on to an old house.
- an extra charge: Add-ons for taxes and tour guide fees boosted the price of the vacation to $2,500.
- an additional item, as a rider or provision: This is just another legislative add-on.
- anything added on: a hi-fi system that can be augmented with add-ons like extra speakers.
- being installed or provided as an add-on: an add-on speaker system.
Origin of add-on
First recorded in 1945–50; noun and adj. use of verb phrase add on
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for add-on
I once showed up to read and had been warned that a debut writer was also reading that night—a last minute add-on.How I Write: Julianna Baggott
February 12, 2014
Unlike a phone, wearable technology is an add-on, an accessory, something that comes on top.Is Wearable Technology a Fad or the Future?
January 9, 2014
As a result, it felt like an add-on, meant to artificially moisten another otherwise dry address.The Opposite of Rousing
December 2, 2009
- a feature that can be added to a standard model or package to give increased benefits
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for add-on
Online Etymology Dictionary, © 2010 Douglas Harper