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Now, this is kinda wierd, cos I don't really have a definition of Intelligence to work with myself sweatdrop

But, using somebody else's....

Then comes the question "what is Truth?"
"How do you define Truth?"

Like everything in Physics, you can prove things beyond a doubt so long as you have the right assumptions for them to work beforehand.

If we assume that everything we observe is "Truthfull" and The Universe isn't playing tricks on us, then why shouldn't we be able ot have absolute Knowledge of The Truth?
So... if we can make that assumption... I agree.
But here, you seem to redefine it; perhaps by Truth you mean the sum total of all Observable Knowledge that can be obtained.

In which case, doing anything at all is leading us in that Direction, though some Actions will get one there quicker than others.

For you, then, Intelligence is a measure of the maximum potential rate of change of Understanding that a person can achieve.

Sounds like a definition I'd like to have as well ^_^

In my opinion intelligence is like a computer. If you are very intelligent you can store lots of information quickly the recall it even faster. Also I don't think you are necessarily "intelligent" if you can play sports well because that would depend on a different part of the brain, heredity, and muscular strength, endurance, and flexibility thought I will admit the rules of the sport and strategies would count as intelligence.

Intelligence: The ability and possibility of thinking and exercising certain abilities by the measurement of how much you have used those attributes in a sensible fashion that aids ones own survival. In other words, the measurement of what you can do divided by the measurement of what you did do measured against the best possible solution(s), complications added.

I would say yes and no because you may be able to measure potential but not how much of the potential will be used. You could probably approximate though.