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

 

API

 noun
noun
BrE BrE//ˌeɪ piː ˈaɪ//
 
; NAmE NAmE//ˌeɪ piː ˈaɪ//
 
 
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the abbreviation for application programming interface (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 company is opening up its API so that outside developers can use it to build their own programs.