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add-on

American  
[ad-on, -awn] / ˈædˌɒn, -ˌɔn /

noun

  • add-ons
    plural
  1. a device or unit added to equipment or a construction.

    an add-on to a computer;

    a nice add-on to an old house.

  2. an extra charge.

    Add-ons for taxes and tour guide fees boosted the price of the vacation to $2,500.

  3. an additional item, as a rider or provision.

    This is just another legislative add-on.

  4. anything added on.

    Our sable faux fur vest is an easy add-on for dressy or casual occasions.


adjective

  1. being installed or provided as an add-on.

    Add-on packs for this game are just a few dollars.

add-on British  

noun

  1. 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

Other Word Forms

Noun Inflected Forms

Etymology

Origin of add-on

First recorded in 1945–50; noun and adj. use of verb phrase add on

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Foodbank manager Maria Stevenson said pet food was an add-on service at Salisbury Foodbank, but she often saw "older clientele" putting their pets' needs before themselves.

From BBC Aug. 18, 2026

The strongest stocks often provide add-on buy points during longer-term advances, and this setup may offer one above the bullish ascending triangle trigger at $500.

From Barron's May 27, 2026

Chief Executive Todd Penegor said the pizza chain is aiming to address the issue by improving its value perception and stepping up innovation to attract new customers, sell more premium pizzas and boost add-on purchases.

From The Wall Street Journal May 7, 2026

Spirit grew quickly in the early 2000s, paving the way for other budget carriers such as Frontier to offer low-cost tickets with countless paid add-on options for seats and in-flight beverages.

From Los Angeles Times May 1, 2026

Vivian was speaking slightly above a whisper, but Margaret’s kitchen is right next to the add-on living room, so I could hear practically everything.

From "Silent To The Bone" by E.L. Konigsburg

Many of the restaurant’s customers pay extra for double or triple add-ons of eggs, chicken or steak.

From Los Angeles Times Aug. 22, 2026

Tottenham have agreed a deal with Manchester City to sign winger Savinho for £75m, with a further £10m in potential add-ons.

From BBC Aug. 21, 2026

Defender Trevoh Chalobah is close to joining Como for £31m, including add-ons, while goalkeeper Filip Jorgensen is joining sister club Strasbourg on loan.

From BBC Aug. 7, 2026

And within days of each release, a global community of contributors builds the supporting software—the add-ons and utilities that make a model practical to use.

From The Wall Street Journal Aug. 6, 2026

Or consider the automobile dealership: a salesman does his best to obscure the car’s base price under a mountain of add-ons and incentives.

From "Freakonomics: A Rogue Economist Explores the Hidden Side of Everything" by Steven D. Levitt

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