Mental retardation

mental retardation   n.  Subnormal intellectual development as a result of congenital causes, brain injury, or disease and characterized by any of various cognitive deficiencies, including impaired learning, social, and vocational ability. Also called mental deficiency.

Main Entry: mental retardation
Function: noun
: subaverage intellectual ability that is equivalent to or less than an IQ of 70, is present from birth or infancy, and ismanifested especially by abnormal development, by learning difficulties, and by problems in social adjustment —mentally retarded adjective

mental retardation n.
Subnormal intellectual development or functioning that is the result of congenital causes, brain injury, or disease and is characterized by any of various deficiencies, ranging from impaired learning ability to social and vocational inadequacy. Also called mental deficiency.