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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 stands for Intelligence Quotientâ¦ It is a ratio, therefore, of a personâs intelligence compared to the mean (average). The average IQ is 100, which stands for a ratio of 1:1 - the further the deviation (higher or lower than 100), the further a person falls from the norm. In reality, though, IQ scores are generally distributed on a bell curve, with approximately 68% of people falling within the 85â115 category.