killer app

Computers, Informal.
an application that surpasses its competitors.

Origin:
1985–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
For many on campus, checking e-mail on the go is the first killer app of the hand-held world.
If this works nearly as well as it looks on the video demo, this could be a killer app.
In that world of high tech traffic control, benign dictatorship is the killer app, and democracy is a bug.
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