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

He was not informed the car dealership was being paid 25% commission, which was added on to what he had to pay back.

From BBC

He added on Sky Sports: "It's a good game to learn as a manager. I am going to learn a lot with Russell because they did really well."

From BBC

"You have to do things," Paul adds on the importance of keeping friendship fresh.

From BBC

“It’s one of those things where you’ve got to keep adding on and scoring runs,” Bates said, “and putting pressure on the other team.”

From Los Angeles Times

Tuition prices seem like they added on extra zeroes just for fun.

From Salon