achievement age divided by chronological age, usually expressed as a multiple of 100. The achievement quotient of a ten-year-old child whose achievement age equals that of the average twelve-year-old is 1.2, or 120.
British Dictionary definitions for achievement quotient
achievement quotient
noun
1.
(psychol) a measure of ability derived by dividing an individual's achievement age by his actual age AQ
achievement quotient in Medicine
achievement quotientn. The ratio of actual performance to expected performance or to the norm achieved by individuals of a particular age, usually on a standard achievement test.