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Meaning of “killer app” in the English Dictionary

"killer app" in British English

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(Definition of killer app from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"killer app" in Business English

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killer appnoun [C]

uk   us   (also killer ap, killer application) IT
computer software that is very popular or useful, especially software that is the reason people buy certain computer systems, mobile phones, etc.: Mobile access to social networking sites is the next killer app.
a use for a particular technology that becomes extremely popular and is the reason people want that technology: At the time they thought that e-learning would be the killer app of the Internet.
(Definition of killer app from the Cambridge Business English Dictionary © Cambridge University Press)
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“killer app” in Business English

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