Intelligence is a general mental capability that involves the ability to reason, plan, solve problems, think abstractly, comprehend ideas and language, and learn.
That works fine as far as I'm concerned.
For a generic definition, I like this one: "the ability to comprehend; to understand and profit from experience" (Princeton)
However, for the purposes of our definition project, we also must address the fractal/emergent question. I suggest we stipulate that it not be prejudiced either way. I also do not object if you want to go with a tougher set of properties like the ones I raised (decision-making, awareness, purpose).
My counter proposals: