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The term 'smart' is another word for intelligence.
Intelligence is the brain's cognitive ability. Intelligence involves one's mental capacity to learn, solve problems, reason, plan, think abstractly, and comprehend ideas and language.
Heres one credible approach to intelligence:
Intelligence 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
Obviously different psychologists define or perceive 'intelligence' differently.
Heres another definition of Intelligence from "Intelligence: Knowns and Unknowns" a report of a task force convened by 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
"The summit is just a halfway point"
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