MENTAL RETARDATION
\mˈɛntə͡l ɹɪtɑːdˈe͡ɪʃən], \mˈɛntəl ɹɪtɑːdˈeɪʃən], \m_ˈɛ_n_t_əl ɹ_ɪ_t_ɑː_d_ˈeɪ_ʃ_ə_n]\
Definitions of MENTAL RETARDATION
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lack of normal development of intellectual capacities
By DataStellar Co., Ltd
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Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual is mentally retarded. IQ scores between 70 and 79 are in the borderline mentally retarded range. Scores below 67 are in the retarded range. (Joynt, Clinical Neurology, 1992, Ch55, p28)
By DataStellar Co., Ltd
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