killer application

World English Dictionary
killer application
 
n
a highly innovative, very powerful, or extremely useful computer application; esp one sufficiently important as to justify purchase of the equipment or software

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Dictionary.com's 21st Century Lexicon
Main Entry:  killer application
Part of Speech:  n
Definition:  any computer program that is so useful or great that people feel they must have it; also called killer app
Etymology:  killer 'impressive, excellent' + (computer) application
Usage:  computing
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