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application program interface

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Abbreviation Of: 
API
Abbreviation: 
API

(sometimes called middleware), n. (API, abbr.) ~ Software conventions that provide a link between one application and another piece of software.

Notes: 

APIs are used primarily to support portability of applications across different operating systems. A single application makes calls to APIs customized to support that application on different platforms. However, APIs may also support interactions between an application and the system or between different applications.