Usually means: Reduction in speed or progress.
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We found 35 dictionaries that define the word retardation:

General (25 matching dictionaries)
  1. retardation: Merriam-Webster.com
  2. retardation: Oxford Learner's Dictionaries
  3. retardation: American Heritage Dictionary of the English Language
  4. retardation: Collins English Dictionary
  5. retardation: Vocabulary.com
  6. Retardation, retardation: Wordnik
  7. retardation: Cambridge Advanced Learner's Dictionary
  8. retardation: Wiktionary
  9. retardation: Webster's New World College Dictionary, 4th Ed.
  10. retardation: The Wordsmyth English Dictionary-Thesaurus
  11. retardation: Infoplease Dictionary
  12. retardation: Dictionary.com
  13. retardation: Online Etymology Dictionary
  14. retardation: Cambridge Essential American English Dictionary
  15. Retardation (music), Retardation: Wikipedia, the Free Encyclopedia
  16. Retardation: Online Plain Text English Dictionary
  17. retardation: Webster's Revised Unabridged, 1913 Edition
  18. retardation: Rhymezone
  19. Retardation: AllWords.com Multi-Lingual Dictionary
  20. retardation: Webster's 1828 Dictionary
  21. retardation: Free Dictionary
  22. retardation: Mnemonic Dictionary
  23. retardation: Dictionary/thesaurus

Art (1 matching dictionary)
  1. Virginia Tech Multimedia Music Dictionary (No longer online)

Business (2 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. retardation: Legal dictionary

Computing (1 matching dictionary)
  1. retardation: Encyclopedia

Medicine (4 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Hepatitis C Information Central (No longer online)
  4. retardation: Medical dictionary

Science (1 matching dictionary)
  1. Archaeology Wordsmith (No longer online)

Slang (1 matching dictionary)
  1. Retardation: Urban Dictionary

(Note: See retardations as well.)

Definitions from Wiktionary (retardation)

noun:  The act of retarding or delaying; hindrance.
noun:  (acoustics) The distance by which one wave is behind another.
noun:  (music) The act of diminishing the rate of speed.
noun:  (telegraphy) A decrease in the speed of telegraph signalling.
noun:  The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness.
noun:  (colloquial, derogatory, offensive) Extreme stupidity.
noun:  That which retards; an obstacle; an obstruction.
noun:  (physics) Deceleration; reduction in the magnitude of velocity.
noun:  (music) A suspension which resolves upwards.
noun:  (psychology, dated, offensive) Ellipsis of mental retardation. [(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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