\ ˈad-ˌin
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Definition of add-in
: being or able to be added to and enclosed within an existing system (such as a computer)
add-in hardware
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“Add-in.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/add-in. Accessed 19 Jun. 2021.
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The first known use of add-in was in 1980
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