APA Dictionary of Psychology

a measure of crystallized abilities (see Cattell–Horn theory of intelligence) designed to be administered in conjunction with Raven’s Progressive Matrices. It consists of 88 words and is available in three forms: one requiring participants to define all words, one requiring participants to recognize the meanings of all words by choosing the correct synonym for each from among six options, and one requiring participants to define half of the words and choose synonyms for the rest. [originally developed in 1943 by British psychologist John C. Raven (1902–1970) at Mill Hill Emergency Hospital, London]