What is the meaning of App?

An application (program), especially a small one designed for a mobile device.

application (use, purpose; not a computer program)

application (to a college etc.)

appetizer

An appearance in a game.

app

app

an app

a text message sent using an app

a chat on a text messaging app, particularly a group chat

app (for a mobile device)

Only used in bon app (bon appétit)

app, application

app (for a mobile device)

app

father-in-law

app (small computer application)

app

an app (especially on mobile phones and the like, like in English)

Expresses reproach; "Hey, don't do that!"

Source: wiktionary.org