An entrepreneur is someone who:
1) Identifies a problem and then grapples to find a solution. (S)He will try all viable alternatives in the face of seemingly insurmountable obstacles and not give up at the first sing of failure. (S)He will learn what they can from that failure to improve on the next model.
2) Is a free-thinker and independent spirit. (S)He is not bogged down by "what is" and rather concerns themselves with "what can be".