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

Examples of add-in in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Plain water is one of the best options, especially when your smoothie already includes fruit, protein, and other flavorful add-ins. HEALTH, 6 Aug. 2026 The add-in includes 15 grams of protein and will cost customers $2, the company said. Saleen Martin, USA Today, 3 Aug. 2026 This now ubiquitous queso dip add-in was born in 1943 at a canning plant in a tiny Rio Grande Valley town. Alana Al-Hatlani, Southern Living, 23 July 2026 Chia seeds are another great recipe add-in that can offer similar benefits to flaxseeds for blood pressure support. Eleesha Lockett, Verywell Health, 17 July 2026 See All Example Sentences for add-in

Word History

First Known Use

1980, in the meaning defined above

Time Traveler
The first known use of add-in was in 1980

Browse Nearby Words

Cite this Entry

“Add-in.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/add-in. Accessed 13 Aug. 2026.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster