Definition of killer app in English:

killer app


(also killer application)
  • A feature, function, or application of a new technology or product which is presented as virtually indispensable or much superior to rival products.

    • ‘E-mail was the killer app of the Internet revolution, and now people dread opening theirs each morning.’
    • ‘Every platform vendor hopes someone will produce a killer app for its product, driving up sales of the platform technology as more and more people want it for themselves.’
    • ‘His entire rant is about how mobile email won't be the killer app for mobile devices.’
    • ‘Adult material could prove the killer app the likes of WAP have been waiting for.’
    • ‘On the same day, Nintendo will launch Nintendogs - the Tamagochi-like app that's proving to be something of a killer app for the console.’