The Open Dictionary

add-on

noun

UK/ˈæd.ɒn/
US/ˈæd.ɑːn/

Definitions of add-on noun

  1. Countable

    An additional piece of hardware that can be connected to a computer to expand its functionality.

    • This external hard drive is a useful add-on for the computer.

    • I bought a new graphics card as an add-on to improve my work efficiency.

    • Many gamers purchase additional controllers as add-ons to enhance their gaming experience.

  2. Countable

    An additional element or feature that is attached or added to something, particularly to an established plan, system, or agreement.

    • The contract includes an add-on clause detailing the confidentiality agreement.

    • We need to propose an add-on budget for this project to cover the extra expenses.

    • The promotion is an add-on benefit that provides an additional discount.