In Android contexts, should the 'a' in 'app' be uppercase always or lowercase?
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Lowercase, except at the beginning of a sentence. App is short for application. And, given that you wouldn't capitalize application, no need to capitalize app.
In a formal paper, you should consider writing out application. At least for the first usage like this: application (app).
Here is a search of the word app on Engadget. Note the consistent lowercase usage. (Click to enlarge:)
protected by tchrist Apr 14 '15 at 0:28
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