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moron 1.A stupid person; a dolt. 2.Psychology. A person of mild mental retardation having a mental age of from 7 to 12 years and generally having communication and social skills enabling some degree of academic or vocational education. The term belongs to a classification system no longer in use and is now considered offensive. [From Greek mron, neuter of mros, stupid, foolish.] moronic (m-rnk, m) adj. moronically adv. moronism or moronity (m-rn-t, m) n.