Gifted individuals are those who demonstrate outstanding levels of aptitude (defined as an exceptional ability to reason and learn) or competence (documented performance or achievement in top 10% or rarer) in one or more domains. Domains include any structured area of activity with its own symbol system (e.g., mathematics, music, language) and/or set of sensorimotor skills (e.g., painting, dance, sports).

The development of ability or talent is a lifelong process. It can be evident in young children as exceptional performance on tests and/or other measures of ability or as a rapid rate of learning, compared to other students of the same age, or in actual achievement in a domain. As individuals mature through childhood to adolescence, however, achievement and high levels of motivation in the domain become the primary characteristics of their giftedness. Various factors can either enhance or inhibit the development and expression of abilities.

A person's giftedness should not be confused with the means by which giftedness is observed or assessed. Parent, teacher, or student recommendations, a high mark on an examination, or a high IQ score are not giftedness; they may be a signal that giftedness exists. Some of these indices of giftedness are more sensitive than others to differences in the person's environment.

(Source: National Association for Gifted Children)