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intelligence quotient - a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100) I.Q., IQ. ratio - the relative magnitudes of two quantities (usually expressed as a quotient)
a commonly used standardized intelligence test that yields an IQ score. intelligence quotient (IQ) a single number that represents a child's intelligence, computed by dividing the child's mental age by the child's chronological age and multiplying the result by 100. Wechsler Adult Intelligence Scale (WAIS-III) a commonly used intelligence test whose combined verbal and performance subtest scores yield an IQ score.