Definitions for "Intelligence quotient"
a number intended to indicate a person's level of intelligence: It is the mental age (as shown by intelligence tests) multiplied by 100 and divided by the chronological age.
1. originally, the ratio of mental age to chronological age; that is, MA/CA 3 100. 2. today, the score on an intelligence test, calculated by comparing a person's performance to norms for her or his age group. (349)
A ratio measure to indicate whether a child's mental age (MA) is ahead or behind his chronological age (CA); specifically IQ = 100 x MA/CA. See also deviation IQ, mental age.