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Intellectual disability (ID), also known as general learning disability, and formerly as mental retardation, is a generalized neurodevelopmental disorder characterized by significant impairment in intellectual and adaptive functioning. Intellectual disabilities may first be apparent during childhood or be developmentally acquired later in life due to illness or traumatic brain injury. The causes of the disability may be either developmental or genetically inherited. Children with intellectual disability typically have an intelligence quotient (IQ) below 70 and deficits in at least two adaptive behaviors that affect everyday living.

Source: Wikipedia