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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)
An intelligence quotient, or IQ, is a score derived from one of several standardized tests designed to assess intelligence. The IQ score is something people often talk about, but an IQ is not everything, and there are some surprising results when looking at some famous people's IQs.