Right answer is,

Polymorphrism means the "Many forms", is feature that 
allows one interface to be used for a general class of 
actions.  The specifc action is determined by the nature of 
the situation.

Two types of polymorphrism, 1. Compile time 
(Operator/Functional overloading) [Language 'C' supported 
polymorphrism]. 2. Run time (Virtual function).

Example:
    //function prototype
    int Addition(int iOperand1, int iOperand2);
    float Addition(float fOperand1, float fOperand2);
    float Addition(int iOperand1, float fOperand2);