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English definition of “app”

app

noun [C] /æp/
abbreviation for application: a computer program that is designed for a particular purpose: You can run an app on your PC that will find the files and burn them to a CD. abbreviation for application: a computer program or piece of software designed for a particular purpose that you can download onto a mobile phone or other mobile device: There are apps for everything, from learning a language to booking movie tickets.
(Definition of app noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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