Medical Definition of Intelligence quotient
Intelligence quotient: An attempt to measure the intelligence of someone. Abbreviated IQ. The IQ score is usually based upon the results of a written test. To calculate the IQ, the person's mental age as determined by a test is divided by chronologic age, and the result is multiplied by 100.
See also intelligence test; intelligence, non-verbal; intelligence, verbal.
Last Editorial Review: 6/9/2016
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