killer app - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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killer app

noun [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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