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

Related Words

• preservative 
• supplement