n. level of mental age at which all items in a standardized intelligence test can be passed. Specifically, it applies the Stanford-Binet intelligence scale. At present, the mental-age construct is not as popular and the concept is not as widely-used as before. Also called basal age. See mental age.
BASAL MENTAL AGE: "To gather results on your basal mental age, one has to pass a psychological exam such as the Stanford-Binet intelligence test."