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Definition of IQ

IQ: Abbreviation for intelligence quotient, an attempt to measure the intelligence of someone.

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 their chronologic age and the result is multiplied by 100.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=8325
Last Editorial Review: 8/28/2013

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