add-in

adjective
\ ˈad-ˌin How to pronounce add-in (audio) \

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

Buying Guide

Our Reviews team has selected the best monitors.

Learn More About add-in

Dictionary Entries Near add-in

addictive

add-in

adding machine

See More Nearby Entries 

Statistics for add-in

Cite this Entry

“Add-in.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/add-in. Accessed 12 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Challenging Words You Should Know

  • hedgehog reading a book
  • Often used to describe “the march of time,” what does inexorable mean?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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