Medical Dictionary
mental retardation
noun
Medical Definition of MENTAL RETARDATION
: subaverage intellectual ability equivalent to or less than an IQ of 70 that is accompanied by significant deficits in abilities (as in communication or self-care) necessary for independent daily living, is present from birth or infancy, and is manifested especially by delayed or abnormal development, by learning difficulties, and by problems in social adjustment
—mentally retarded adjective
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