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Definition of API noun from the Oxford Advanced Learner's Dictionary

API

noun
 
/ˌeɪ piː ˈaɪ/
 
/ˌeɪ piː ˈaɪ/
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  1. a set of programming tools that enables a program to communicate with another program or an operating system, and that helps software developers create their own applications (= pieces of software) (the abbreviation for
    application programming interface
    )
    • The company is opening up its API so that outside developers can use it to build their own programs.

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