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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 quotient, and it's meant to measure a person's ability to acquire and apply knowledge and skills. That first part -- the ability to acquire and apply -- is key. IQ doesn't measure a person's general knowledge of facts and figures, like whether they know the capital of Russia.