Definition of killer app in English:

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killer app

(also killer application)

noun

informal
A feature, function, or application of a new technology or product that is presented as virtually indispensable or much superior to rival products.
Example sentences
  • 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.

For editors and proofreaders

Syllabification: kill·er app

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