Intelligent is the ability of think, is how fast you think. When you say "he is more intelligent than me" you say "He thinks much faster than me. At least that's what my teachers told me.

I think it's how much you know and how you apply it.

According to Dungeons and Dragons, Wisdom and Intelligence are two seperate skills.

Some wikipedia: [quote]The definition of intelligence is controversial. Groups of scientists have stated the following: from "Mainstream Science on Intelligence" (1994), an editorial statement by fifty-two researchers: A very general mental capability that, among other things, involves the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly and learn from experience. It is not merely book learning, a narrow academic skill, or test-taking smarts. Rather, it reflects a broader and deeper capability for comprehending our surroundings—"catching on," "making sense" of things, or "figuring out" what to do.[5] from "Intelligence: Knowns and Unknowns" (1995), a report published by the Board of Scientific Affairs of the American Psychological Association: Individuals differ from one another in their ability to understand complex ideas, to adapt effectively to the environment, to learn from experience, to engage in various forms of reasoning, to overcome obstacles by taking thought. Although these individual differences can be substantial, they are never entirely consistent: a given person's intellectual performance will vary on different occasions, in different domains, as judged by different criteria. Concepts of "intelligence" are attempts to clarify and organize this complex set of phenomena. Although considerable clarity has been achieved in some areas, no such conceptualization has yet answered all the important questions, and none commands universal assent. Indeed, when two dozen prominent theorists were recently asked to define intelligence, they gave two dozen, somewhat different, definitions.[6][7][/quote]Honestly, the definition varies so much from person to person that it seems easier to just directly describe what you're thinking of in most cases. Personally, it's your ability to apply your 'toolkit'/knowledge base in order to solve a given problem. If your related knowledge base for a given problem is larger, it'll require less intelligence to solve it.

I see as the ability to utilize things rather than to learn things.

I define intelligence as the ability to learn and understand things. A dumb, or even normal person can have quantum physics described to them in detail and be completely unable to grasp any of it. A very intelligent person could at least get the gist of it.

Completely arbitrary.

If scientists who study the brain can't agree on what intelligence is, what chance do I have?

Intelligence is adapting.

Means knowing when to use what you know and apply it to your current situation. Not be all snooty about how smart you are.