|psychol See also intelligence quotient the mental ability of a child, expressed in years and based on a comparison of his test performance with the performance of children with a range of chronological ages|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
mental age n.
Abbr. MA, M.A.
A measure of mental development as determined by intelligence tests, generally restricted to children and expressed as the age at which that level is typically attained.
intelligence test score, expressed as the chronological age for which a given level of performance is average or typical. An individual's mental age is then divided by his chronological age and multiplied by 100, yielding an intelligence quotient (IQ). Thus, a subject whose mental and chronological ages are identical has an IQ of 100, or average intelligence. However, if a 10-year-old has a mental age of 13, his IQ is 130, well above average. Since the average mental age of adults does not increase past age 18, an adult taking an IQ test is assigned the chronological age of 18
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