>  NH> Yesterday I was asked to give a simple definition of polymorphism.

    Weird! The word polymorph does not occur in the ISO document that
defines ANSI C. I doubt that polymorphism can exist in a procedural
language.

    Any thing (e.g carbon) that can exist in different forms (e.g. soot,
graphite, diamond) displays polymorphism.

    The whole subject has more affinity with alchemy than with programming,
but then so does OOP. :-) You could stretch it to include operator
overloading in C++.

Best Wishes,
Bill.

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