add-in

adjective
\ˈad-ˌin \

Definition of add-in 

: being or able to be added to and enclosed within an existing system (such as a computer) add-in hardware

Other Words from add-in

add-in noun

First Known Use of add-in

1980, in the meaning defined above

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Time Traveler for add-in

The first known use of add-in was in 1980

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