- A number seen as a measure of a person's intelligence, usually representing the person's score on an intelligence test as expressed in relation to the scores of others who have taken the same test, with the average score set at 100.
- The ratio of tested mental age to chronological age, usually expressed as a quotient multiplied by 100. No longer in scientific use.
(plural intelligence quotients)
A calque of German Intelligenzquotient.