app Meaning in the Cambridge English Dictionary
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Meaning of “app” in the English Dictionary

"app" in British English

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appnoun [C]

uk   us   /æp/
abbreviation forapplication: a ​computerprogram that is ​designed for a ​particularpurpose: You can ​run an app on ​your PC that will ​find the ​files and ​burn them to a CD. abbreviation for application: a ​computerprogram or ​piece of ​softwaredesigned for a ​particularpurpose that you can download onto a ​mobilephone or other ​mobiledevice: There are apps for everything, from ​learning a ​language to ​bookingmovietickets.
(Definition of app from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"app" in Business English

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appnoun [C]

uk   us   /æp/
IT abbreviation for application or ​applicationprogram: a ​computerprogram that is ​designed for a particular ​purpose: After ​plugging the ​unit into your ​wirednetwork, you ​run a little app on your PC that ​searches the ​network to ​locate the camera.
See also
IT, COMMUNICATIONS abbreviation for application or ​applicationprogram: a ​smallcomputerprogram that you can download onto a ​mobilephone: There are apps for everything, from ​learning Swedish to ​booking cinema ​tickets.
(Definition of app from the Cambridge Business English Dictionary © Cambridge University Press)
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