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We found 52 dictionaries with English definitions that include the word letter:
Click on the first link on a line below to go directly to a page where "letter" is defined.

General (32 matching dictionaries)

1. letter: Merriam-Webster.com [home, info]
2. letter: Oxford Learner's Dictionaries [home, info]
3. letter: American Heritage Dictionary of the English Language [home, info]
4. letter, the letter: Collins English Dictionary [home, info]
5. letter: Vocabulary.com [home, info]
6. letter, letter: Macmillan Dictionary [home, info]
7. Letter, letter: Wordnik [home, info]
8. letter: Cambridge Advanced Learner's Dictionary [home, info]
9. letter: Wiktionary [home, info]
10. letter: Webster's New World College Dictionary, 4th Ed. [home, info]
11. letter: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. letter: Infoplease Dictionary [home, info]
13. Letter, letter: Dictionary.com [home, info]
14. letter: Online Etymology Dictionary [home, info]
15. letter: UltraLingua English Dictionary [home, info]
16. letter: Cambridge Dictionary of American English [home, info]
17. letter: Cambridge International Dictionary of Idioms [home, info]
18. Letter (alphabet), Letter (message), Letter (paper size), Letter, The Letter (Avant album), The Letter (Box Tops song), The Letter (Hoobastank song), The Letter (Lemar album), The Letter (Seinfeld), The Letter (Seinfeld episode), The Letter (Sinhala film), The Letter (The Box Tops song), The Letter (Wayne Newton song), The Letter (opera), The Letter (play), The Letter (poem), The Letter (song), The Letter (video game), The Letter: Wikipedia, the Free Encyclopedia [home, info]
19. Letter: Online Plain Text English Dictionary [home, info]
20. letter: Webster's Revised Unabridged, 1913 Edition [home, info]
21. letter: Rhymezone [home, info]
22. letter, letter (de): AllWords.com Multi-Lingual Dictionary [home, info]
23. letter: Webster's 1828 Dictionary [home, info]
24. Letter: 1911 edition of the Encyclopedia Britannica [home, info]
25. letter: Free Dictionary [home, info]
26. letter: Mnemonic Dictionary [home, info]
27. letter: WordNet 1.7 Vocabulary Helper [home, info]
28. letter: LookWAYup Translating Dictionary/Thesaurus [home, info]
29. letter: Dictionary/thesaurus [home, info]
30. letter: Wikimedia Commons US English Pronunciations [home, info]

Art (3 matching dictionaries)

31. letter: The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) [home, info]
32. Letter: Glossary of Stamp Collecting Terms [home, info]
33. letter: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business (4 matching dictionaries)

34. letter: Glossary of Legal Terms [home, info]
35. LETTER: Bouvier's Law Dictionary 1856 Edition [home, info]
36. Letter (disambiguation), letter: Legal dictionary [home, info]
37. letter: BusinessDictionary.com [home, info]

Computing (3 matching dictionaries)

38. Letter: Unicode Glossary [home, info]
39. Letter (disambiguation): Encyclopedia [home, info]
40. letter: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

41. Letter [Publication Type]: Medical Dictionary [home, info]
42. letter: online medical dictionary [home, info]
43. letter: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

44. Letter: Brilliant Dream Dictionary [home, info]
45. letter: Idioms [home, info]

Religion (1 matching dictionary)

46. Letter: Easton Bible [home, info]

Science (3 matching dictionaries)

47. letter: LITTLE EXPLORERS(TM) Picture Dictionary [home, info]
48. letter: Archaeology Wordsmith [home, info]
49. Letter: Eric Weisstein's World of Mathematics [home, info]

Slang (1 matching dictionary)

50. Letter, letter: Urban Dictionary [home, info]

(Note: See letters for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (letter) ▸ noun:  a written message addressed to a person or organization ("Mailed an indignant letter to the editor") ▸ noun:  an award earned by participation in a school sport ("He won letters in three sports") ▸ noun:  the conventional characters of the alphabet used to represent speech ("His grandmother taught him his letters") ▸ noun:  a strictly literal interpretation (as distinct from the intention) ("He followed instructions to the letter") ▸ noun:  owner who lets another person use something (housing usually) for hire ▸ verb:  win an athletic letter ▸ verb:  mark letters on or mark with letters ▸ verb:  set down or print with letters ▸ Also see letters ▸ Word origin ▸ Words similar to letter ▸ Usage examples for letter ▸ Idioms related to letter (New!) ▸ Popular adjectives describing letter ▸ Words that often appear near letter ▸ Rhymes of letter ▸ Invented words related to letter