Definition of add-in
:being or able to be added to and enclosed within an existing system (such as a computer)
- add-in hardware
—
-
Trending Now:
More Trending:
- dotage, dotard otherwise federalism bodega carceral
- ALL
What's Trending Now
More Trending Words
From the M-W Editors
First Known Use of add-in
1980
Learn More about add-in
Seen and Heard
What made you want to look up add-in? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!