a poor ability to understand or to profit from experience

slow to learn or understand; lacking intellectual acuity

retardation sufficient to fall outside the normal range of intelligence

mild mental retardation

extreme mental retardation

retardation more severe than a moron but not as severe as an idiot

A condition in which a person with a mental disability, such as an autism spectrum disorder, demonstrates profound and prodigious capacities or abilities far in excess of what would be considered normal.