Usually means: Significantly below average intellectual functioning.
Definitions Related words Phrases Mentions
We found 29 dictionaries that define the word mental retardation:

General (13 matching dictionaries)
  1. mental retardation: Merriam-Webster
  2. mental retardation: American Heritage Dictionary of the English Language
  3. mental retardation: Collins English Dictionary
  4. mental retardation: Vocabulary.com
  5. mental retardation: Wiktionary
  6. mental retardation: The Wordsmyth English Dictionary-Thesaurus
  7. mental retardation: Infoplease Dictionary
  8. mental retardation: Dictionary.com
  9. Mental Retardation, Mental retardation: Wikipedia, the Free Encyclopedia
  10. mental retardation: Rhymezone
  11. mental retardation: FreeDictionary.org
  12. mental retardation: Mnemonic Dictionary
  13. mental retardation: TheFreeDictionary.com

Business (1 matching dictionary)
  1. mental retardation: Legal dictionary

Computing (1 matching dictionary)
  1. mental retardation: Encyclopedia

Medicine (13 matching dictionaries)
  1. mental retardation: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Mental retardation: MedTerms.com Medical Dictionary
  4. Medical Dictionary (No longer online)
  5. Mental retardation, Retardation, mental: Merck Manuals
  6. online medical dictionary (No longer online)
  7. Health and Wellness Dictionary (No longer online)
  8. Specific Diseases/Disorders (No longer online)
  9. Mental retardation: MEDLINE plus Illustrated Medical Encyclopedia
  10. Terms in the field of Psychiatry and Neurology (No longer online)
  11. mental retardation: Medical dictionary
  12. University of Maryland Glossary of Medical Terms (No longer online)
  13. Mental retardation: Drug Medical Dictionary

Slang (1 matching dictionary)
  1. mental retardation: Urban Dictionary

(Note: See mental_retardations as well.)

Definitions from Wiktionary (mental retardation)

noun:  (psychology, dated) A developmental disability in which the person has a very low intelligence quotient, usually below 70, plus difficulty in multiple areas of daily life. Evidence of this disability must have appeared before the person reached adulthood for diagnosis.

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