• Capacity for learning and ability to recall, to integrate constructively and to apply what one has learned; the capacity to understand and to think rationally.
  Sadock's Comprehensive Glossary of Psychiatry and Psychology
  BJ Sadock Titles Press, 2012
• Having the capacity to acquire thought and reason and apply knowledge.
  CRISP Thesaurus
  National Institutes of Health, 2006
• The ability to learn and to deal with new situations and to deal effectively with tasks involving abstractions.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Human intelligence, mental quality that consists of the abilities to learn from experience, adapt to new situations, understand and handle abstract concepts, and use knowledge to manipulate one's environment. Much of the excitement among investigators in the field of intelligence derives from their...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020