The abbreviation of "Intelligence Quotient which is a number used to express the apparent relative intelligence of a person determined by dividing his mental age as reported on a standardized test by his chronological age and multiplying the result by 100IQ: • The abbreviation of “Intelligence Quotient” , which is a number used to express the apparent relative intelligence of a person determined by dividing his mental age as reported on a standardized test by his chronological age and multiplying the result by 100