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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)
You can see that an IQ score of 100 will always mean that a person is exactly where the average person would be, so an IQ of 100 will always mean average intelligence for IQ. If a person is mentally advanced, they might get a score like this: 30 mental years old / 20 actual years old x 100 = 150.