If you specify more than one definition for a function name or an operator in the same scope, you have overloaded that function name or operator. Overloaded functions and operators are described in Overloading functions (C++ only) and Overloading operators (C++ only), respectively.
An overloaded declaration is a declaration that had been declared with the same name as a previously declared declaration in the same scope, except that both declarations have different types.
If you call an overloaded function name or operator, the compiler determines the most appropriate definition to use by comparing the argument types you used to call the function or operator with the parameter types specified in the definitions. The process of selecting the most appropriate overloaded function or operator is called overload resolution, as described in Overload resolution (C++ only).