add-on Hear it!

add-on definition

☆ add·-on (ad′än′)

noun

something added to something else; specif., an option or accessory that can be purchased to enhance the performance, appearance, etc. of the thing to which it is added

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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