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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 well-written IQ test should test not a person's knowledge but their ability to learn. The main goals of an IQ test are to measure a person's spatial ability, mathematical ability, language ability and memory ability. A person with an IQ between 90 and 110 is considered to have average intelligence. A score over 130 indicates an outstanding level of intelligence, while a score below 70 indicates potential mental retardation.