To understand giftedness, and particularly intellectual giftedness, one must understand intelligence. But what is intelligence? In 1921, when the editors of the Journal of Educational Psychology asked 14 famous psychologists that question, the responses varied, but generally embraced two themes. First, intelligence involves the capacity to learn from experience. Second, it involves the ability to adapt to the surrounding environment. Sixty-five years later, 24 cognitive psychologists with expertise in intelligence research were asked the same question (Sternberg & Detterman, 1986). They, too, underscored the importance of learning from experience and adapting to the environment. They also broadened the definition to emphasize the importance of metacognition-people's understanding and control of their own thinking processes. Contemporary experts also more heavily emphasized the role of culture. They pointed out that what is considered intelligent in one culture may be considered less intelligent in another culture (Ang, Van Dyne, & Tan, 2011). To summarize, intelligence is the capacity to learn from experience, using metacognitive processes to enhance learning, and the ability to adapt to the surrounding environment; it may require different adaptations within different social and cultural contexts (Niu & Brass,