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

Industry experts say it’s a possibility, noting that passenger contracts can allow for this very kind of post-booking add-on.

From MarketWatch

Starting April 1, a new add-on fee of $200 will be charged, up from the $149 customers paid in March, according to Cathay’s website.

From The Wall Street Journal

A $10 add-on ticket along with a museum ticket is required to explore the pavilion.

From Los Angeles Times

In December, Comcast launched a storefront for add-on streaming apps and bundles.

From The Wall Street Journal

This may be an indication that dealers are leaving wiggle room to tack on undisclosed add-on charges.

From MarketWatch

Related Words

• preservative
• supplement