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

Paris and Washington will be hoping that Déby sees Moscow as a diplomatically useful add-on, and not an alternative to the West.

From BBC

Subscribers who want to add an outside user can do so with what the company calls an “extra member add-on.”

From Los Angeles Times

Ms Shotbolt says this has enabled Steam to charge an "excessive commission of up to 30%", making UK consumers pay too much for purchasing PC games and add-on content.

From BBC

The NFL will contend that “Sunday Ticket” is an add-on package for the league’s most-devoted and out-of-town fans, along with stating that all games for local teams are available on broadcast networks.

From Seattle Times

"Biodiversity targets are often vague, initiatives are "add-on" rather than integrated, and resources allocated to biodiversity recovery are insufficient," one of the authors said.

From Science Daily