For psychologists, is the capacity to understand the world, think rationally, and use resources effectively.

The concept you are referring to is likely "intelligence." Intelligence in psychology is often defined as the ability to learn from experience, adapt to new situations, understand and handle abstract concepts, and use knowledge to manipulate one’s environment.

Psychologists measure intelligence through various forms of assessments, such as IQ tests, which evaluate different cognitive abilities including reasoning, problem-solving skills, and comprehension.

Moreover, theories of intelligence have evolved; for instance, Howard Gardner proposed the theory of multiple intelligences, which suggests that intelligence is not a single entity but a combination of various cognitive capacities such as linguistic, logical-mathematical, spatial, and interpersonal intelligences among others.

Overall, understanding intelligence provides valuable insights into human behavior and cognitive functioning, impacting education, employment, and personal development.