killer app Definition in the Cambridge English Dictionary
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Definition of “killer app” - English Dictionary

Definition of "killer app" - British English Dictionary

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killer appnoun [C]

uk   /ˌkɪl.əˈræp/  us   /-ɚˈæp/ (also killer application) informal
a ​computerprogram that is much ​better than all ​others of ​itstype a use for a ​particular technology that ​becomesextremelypopular: Many ​softwarecompanies and internet ​providersbelieve that ​e-learning is the next ​killerapp.
(Definition of killer app from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "killer app" - Business English Dictionary

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killer appnoun [C]

uk   us   (also killer ap, killer application) IT
computersoftware that is very popular or useful, especially ​software that is the reason ​peoplebuycertaincomputersystems, ​mobilephones, etc.: Mobile ​access to ​socialnetworkingsites 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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