Polymorphism vs Overriding vs Overloading

Question

In terms of Java, when someone asks:

what is polymorphism?

Would overloading or overriding be

Answer 1

overloading is when you define 2 methods with the same name but different parameters

overriding is where you change the behavior of the base class via a function with the same name in a subclass.

So Polymorphism is related to overriding but not really overloading.

However if someone gave me a simple answer of "overriding" for the question "What is polymorphism?" I would ask for further explanation.