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intelligence quotient

noun, Psychology.
an intelligence test score that is obtained by dividing mental age, which reflects the age-graded level of performance as derived from population norms, by chronological age and multiplying by 100: a score of 100 thus indicates a performance at exactly the normal level for that age group.
Abbreviation: IQ.
Origin of intelligence quotient
First recorded in 1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for intelligence quotient
Historical Examples
  • The intelligence quotient of this girl is 140, which is not reached by more than one child in two hundred.

    The Measurement of Intelligence Lewis Madison Terman
  • Stating the error in terms of the intelligence quotient makes it more evident.

    The Measurement of Intelligence Lewis Madison Terman
  • Thus, an error of 10 months in the mental age of a 5-year-old means an error of almost 15 per cent in the intelligence quotient.

    The Measurement of Intelligence Lewis Madison Terman
  • The intelligence quotient (often designated as I Q) is the ratio of mental age to chronological age.

    The Measurement of Intelligence Lewis Madison Terman
British Dictionary definitions for intelligence quotient

intelligence quotient

a measure of the intelligence of an individual derived from results obtained from specially designed tests. The quotient is traditionally derived by dividing an individual's mental age by his chronological age and multiplying the result by 100 IQ
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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intelligence quotient in Medicine

intelligence quotient n.
Abbr. IQ, I.Q.
An index of measured intelligence expressed as the ratio of tested mental age to chronological age, multiplied by 100.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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intelligence quotient in Culture
intelligence quotient (IQ)

A number meant to measure intelligence. Once the standard measure of human mental capacity; now widely considered to be neither accurate nor fair. Controversy exists today over the effect of race and class on scores and whether IQ tests really measure intelligence. Tests of special aptitudes and personality factors are now favored over the pure intelligence test.

Note: The IQ was originally calculated using the ratio of a person's “mental age” (as measured by a standardized test) and chronological age. An IQ between 90 and 110 is considered average; over 120, superior. (See Stanford-Binet scale.) Few tests still include the controversial notion of mental age.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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