Hi RAZD,
You probably won't find my comments too useful, but I was still interested in the topic, and I had a small thought.
Your definition;
Evolution is the (hereditary) change in species over time.
and the Forum definition, would probably not cause the fundies to lose any sleep.
The theory of evolution, on the other hand, can be stated as “All the living forms in the world have arisen over billions of years from a single common ancestor which itself came from an inorganic form.” This can be equated with the commonly used terms “macroevolution” (used by evolutionist) or simply “theory of evolution” (used by creationists).
This one would.
I suggest you put it all out there on the table so that there can be no misconception.
I also have found it useful to dwell on BIG changes happening one small step at a time. Much of the doubt arises when us neophites try to think on a large scale. Macro evolution, if I understand genetics rightly, is something which occurs on a 'micro' level.
I guess I am wondering if your def. is for those 'in the know', or for the average layman?