Definition of killer app
: a computer application of such great value or popularity that it assures the success of the technology with which it is associated
broadly
: a feature or component that in itself makes something worth having or using
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Who Knew?
-
- What is a ruelle?

Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
The first known use of killer app was in 1988
See more words from the same year