Mental-retardation meaning

Impaired intellectual development resulting from any of various causes, including genetic disorders and brain injury.
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A condition, usually present from birth, characterized by intellectual functioning that is below average: until recently, the preferred technical term, with levels defined in terms of IQ and ranging from borderline (IQ of 71-84) to mild (IQ of 50-55 to approximately 70) to moderate (IQ of 35-40 to 50-55) to severe (IQ of 20-25 to 35-40) to profound (IQ of below 20-25): in technical use, now largely replaced by intellectual disability.
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Intellectual disability.
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Below-average intellectual ability resulting from a genetic defect, brain injury, or disease, and usually present from birth or early infancy.
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A intellectual disability and developmental disability in which the person has an intelligence quotient below 70 plus difficulty in multiple areas of daily life. Evidence of this disability must have appeared before the person reached adulthood.
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