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We found 37 dictionaries with English definitions that include the word retardation:
Click on the first link on a line below to go directly to a page where "retardation" is defined.

General (28 matching dictionaries)

1. retardation: Merriam-Webster.com [home, info]
2. retardation: Oxford Dictionaries [home, info]
3. retardation: American Heritage Dictionary of the English Language [home, info]
4. retardation: Collins English Dictionary [home, info]
5. retardation: Vocabulary.com [home, info]
6. Retardation, retardation: Wordnik [home, info]
7. retardation: Cambridge Advanced Learner's Dictionary [home, info]
8. retardation: Wiktionary [home, info]
9. retardation: Webster's New World College Dictionary, 4th Ed. [home, info]
10. retardation: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. retardation: Infoplease Dictionary [home, info]
12. retardation: Dictionary.com [home, info]
13. retardation: Online Etymology Dictionary [home, info]
14. retardation: UltraLingua English Dictionary [home, info]
15. retardation: Cambridge Dictionary of American English [home, info]
16. Retardation (music), Retardation: Wikipedia, the Free Encyclopedia [home, info]
17. Retardation: Online Plain Text English Dictionary [home, info]
18. retardation: Webster's Revised Unabridged, 1913 Edition [home, info]
19. retardation: Rhymezone [home, info]
20. Retardation: AllWords.com Multi-Lingual Dictionary [home, info]
21. retardation: Webster's 1828 Dictionary [home, info]
22. retardation: Free Dictionary [home, info]
23. retardation: Mnemonic Dictionary [home, info]
24. retardation: WordNet 1.7 Vocabulary Helper [home, info]
25. retardation: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. retardation: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

27. Retardation: Virginia Tech Multimedia Music Dictionary [home, info]

Business (2 matching dictionaries)

28. Retardation: Construction Term Glossary [home, info]
29. retardation: Legal dictionary [home, info]

Computing (1 matching dictionary)

30. retardation: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

31. retardation: online medical dictionary [home, info]
32. Retardation: Hepatitis C Information Central [home, info]
33. retardation: Medical dictionary [home, info]

Science (1 matching dictionary)

34. retardation: Archaeology Wordsmith [home, info]

Slang (1 matching dictionary)

35. Retardation: Urban Dictionary [home, info]

(Note: See retardations for more definitions.)

Quick definitions from WordNet (retardation) ▸ noun:  lack of normal development of intellectual capacities ▸ noun:  the extent to which something is delayed or held back ▸ noun:  the act of slowing down or falling behind ▸ noun:  a decrease in speed ▸ noun:  any agent that retards or delays or hinders ▸ Also see retardations ▸ Word origin ▸ Words similar to retardation ▸ Usage examples for retardation ▸ Popular adjectives describing retardation ▸ Words that often appear near retardation ▸ Rhymes of retardation ▸ Invented words related to retardation