API Endpoint Semantics
According to this Wikipedia article, the endpoint is a web service, defined by a WSDL file, and
does nothing more than define the address or connection point to a web service. It is typically represented by a simple HTTP URL string.
Microsoft uses the term endpoint in various contexts, but they all amount to the same thing: the endpoint is the entire interface, not one particular method.
In the context of a REST endpoint, the endpoint would contain the requisite GET, PUT, POST and DELETE methods (as applicable).