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Comprehensive
Dictionary Suite
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app (informal) in computing, a shortened form of "application program." [1/2 definitions]
application in computing, an application program. [1/6 definitions]
operating system in computing, the software that controls and manages all aspects of a computer's operation, including the execution of application programs; the functioning of computer hardware; data input and output; the timing of and allocation of resources to the execution of multiple, simultaneous tasks; the physical storage and location of data; and computer security. Users interact with the operating system though a graphical user interface.