from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Subnormal intellectual development as a result of congenital causes, brain injury, or disease and characterized by any of various cognitive deficiencies, including impaired learning, social, and vocational ability. Also called mental deficiency.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. lack of normal development of intellectual capacities
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