Defining Polymorphism

Saw an interesting question on StackOverflow today: Polymorphism - Define In Just Two Sentences

Reading the answers, it seemed to me that everyone was getting bogged down in the technical aspects, and was missing the essential point of the term.

So, I added my own answer, writing:

Polymorphism is a $10 word for a $1 idea - that when I ask for something to be done, I don’t care how it is achieved as long as the end result is appropriate. As long as the service is provided correctly, I don’t care about the implementation.

What do you think of my definition?