2. "The capacity to acquire and apply knowledge." The American Heritage Dictionary, fourth edition, 2000 3. "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."
American Psychological Association [28]
4. "The ability to learn, understand and make judgments or have opinions that are based on reason" Cambridge Advance Learner's Dictionary, 2006 5. "Intelligence is 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." Common statement with 52 expert signatories [13]
6. "The ability to learn facts and skills and apply them, especially when this ability is highly developed." Encarta World English Dictionary, 2006 7. ". . . ability to adapt effectively to the environment, either by making a change in oneself or by changing the environment or finding a new one . . . intelligence is not a single mental process, but rather a combination of many mental processes directed toward effective adaptation to the environment." Encyclopedia Britannica, 2006 8. "the general mental ability involved in calculating, reasoning, perceiving relationships and analogies, learning quickly, storing and retrieving information, using language fluently, classifying, generalizing, and adjusting to new situations." Columbia Encyclopedia, sixth edition, 2006 9. "Capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths, relationships, facts, meanings, etc."
Random House Unabridged Dictionary, 2006 10. "The ability to learn, understand, and think about things." Longman Dictionary or Contemporary English, 2006 11. ": the ability to learn or understand or to deal with new or trying situations :
. . . the skilled use of reason (2) : the ability to apply knowledge to manipulate one's environment or to think abstractly as measured by objective criteria (as tests)" Merriam-Webster Online Dictionary, 2006 12. "The ability to acquire and apply knowledge and skills." Compact Oxford English Dictionary, 2006 13. ". . . the ability to adapt to the environment." World Book Encyclopedia, 2006