killer app Definition in Cambridge British English Dictionary
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Definition of "killer app" - British English Dictionary

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killer appnoun [C]

uk   /ˌkɪl.əˈræp/  us   /-ɚˈæp/ (also killer application) informal
a computer program that is much better than all others of its type a use for a particular technology that becomes extremely popular: Many software companies and internet providers believe that e-learning is the next killer app.
(Definition of killer app from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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