A fundamental factor (2) of human intelligence, derived from factor analysis, corresponding roughly to verbal intelligence, consisting of the knowledge and expertise accumulated over a lifetime of experience, and measured by vocabulary and comprehension subtests of IQ tests. The concept was introduced in an article by the English-born US psychologist Raymond B(ernard) Cattell (1905–98) in the journal Psychological Bulletin in 1941 and became widely known after the publication of his book Abilities: Their Structure, Growth and Action (1971). Also called crystallized ability. Compare fluid intelligence. Gc abbrev.