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Intelligence quotient

(Science: psychology) The psychologists index of measured intelligence as one part of a two-part determination of intelligence, the other part being an index of adaptive behaviour and including such criteria as school grades or work performance.

IQ is a score, or similar quantitative index, used to denote a persons standing relative to his age peers on a test of general ability, ordinarily expressed as a ratio between the persons score on a given test and the score which the average individual of comparable age attained on the same test, the ratio being computed by the psychologist or determined from a table of age norms, such as the various wechsler intelligence scales.

Acronym: IQ