add-on

American  

[ad-on, -awn] / ˈædˌɒn, -ˌɔn /

noun

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.

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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

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Etymology

Origin of add-on

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

Example Sentences

“American consumers are feeling the squeeze of $4 gas prices and over $5.50 diesel, especially as airlines and shipping companies add on extra surcharges,” Long said.

From Barron's • Apr. 14, 2026

Karim says investors can buy the shares in the INR190-INR199 range and add on dips to the INR170-INR178 range.

From The Wall Street Journal • Dec. 22, 2025

Maresca repeatedly said he had "nothing to add" on Monday when questioned about his weekend claim that "many people didn't support us".

From BBC • Dec. 15, 2025

Foodies and tennis lovers can add on the country’s best dining experiences to their seats.

From Salon • Nov. 29, 2025

She meant to add on to the tale to make it sound more reasonable, but instead she just looked at Harry.

From "The Heart is a Lonely Hunter" by Carson McCullers

Related Words

• preservative
• supplement