add-on

[ ad-on, -awn ]

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.

adjective

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

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

add-on

noun

1. a feature that can be added to a standard model or package to give increased benefits

Word History and Origins

Origin of add-on¹

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

Example Sentences

Obviously, the Snow/Snowden story was also a much later add-on—and one that reinforces the ideologically correct message.

From The Daily Beast

I once showed up to read and had been warned that a debut writer was also reading that night—a last minute add-on.

From The Daily Beast

Unlike a phone, wearable technology is an add-on, an accessory, something that comes on top.

From The Daily Beast

One such add-on, Zerocoin, debuted at a San Francisco symposium in May.

From The Daily Beast

As a result, it felt like an add-on, meant to artificially moisten another otherwise dry address.

From The Daily Beast