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Can app serve as an accepted abbreviation for application in formal contexts? Is there some context where app is more accepted (for example, when talking about mobile applications)?

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Personally, I've always thought of app as short for applet (i.e. - a relatively trivial piece of software, regardless of how important it may become to some users). I'm sure some people call things like Autocad and Photoshop "apps", but mostly I think apps are little utility-type things you run on a smartphone. –  FumbleFingers Oct 20 '11 at 17:45
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up vote 2 down vote accepted

Your intuition is right. Nowadays, when people say "app" they mean "mobile application."

If you want to talk about an application that doesn't run on a tablet/phone, you can say something is a "Windows app". If you don't want to specify the operating system except to say that it's not a mobile application, just go with "application" or "program".

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is the word "app" itself acceptable (for formal documents), partially acceptable or is it just a slang? –  Louis Rhys Oct 20 '11 at 17:22
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It's slang. "Mobile applications" for formal documents. –  Jeremy Oct 20 '11 at 17:36
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It isn't slang. The OED records it as 'computing colloquial' (with, incidentally, the earliest citation dated 1985). –  Barrie England Oct 20 '11 at 17:39
    
In fact, "app" has been used for application in electronics since at least 1971, and for computer programs since at 1983 (possibly since 1979 or 1981). –  Hugo Oct 20 '11 at 21:33
    
+1 for program over app in terms of non-mobile applications –  XenElement Oct 21 '11 at 0:58
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I've worked as a professional software developer since 1994. Within most software development teams I've worked in, 'app' was simply used as an abbreviation of 'application', regardless of the target platform. It seems that it's only really since the advent of the iPhone that it's become a more formal term specifically for mobile applications. Within software development, we still use it to refer to any application.

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Apple and Google talk about "Apps" even in their formal docs, because they've made a conscious choice to adopt that into their company lexicon. Is that appropriate for all companies? I think the short answer is: it depends. Consider the domain (mobile apps versus windows apps) and the tech-savvy sophistication of the audience.

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