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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)
IQ Test. By John M. Grohol, Psy.D. An IQ test is a psychological measure of a personâs âintelligence quotientâ (IQ). Intelligence Quotient, or IQ, is a theoretical construct used by psychologists within standardized tests as a means of describing oneâs intelligence level. In the most commonly-administered IQ test â the Wechsler Adult Intelligence Scale (WAIS) â an average score is 100; about 95% of IQ scores fall between 70 and 130.