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killer application

noun
1.
a highly innovative, very powerful, or extremely useful computer application; esp one sufficiently important as to justify purchase of the equipment or software
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for killer application
noun

any computer program that is so useful or great that people feel they must have it; also called killer app

Word Origin

killer 'impressive, excellent' + (computer) application

Usage Note

computing

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