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We found 54 dictionaries with English definitions that include the word by:
Click on the first link on a line below to go directly to a page where "by" is defined.

General (36 matching dictionaries)

1. by: Merriam-Webster.com [home, info]
2. by, by-: Oxford Learner's Dictionaries [home, info]
3. b.y, by, by, by-: American Heritage Dictionary of the English Language [home, info]
4. by, by-: Collins English Dictionary [home, info]
5. by: Vocabulary.com [home, info]
6. by: Macmillan Dictionary [home, info]
7. BY, By, By, b'y, by, by, by, bY: Wordnik [home, info]
8. by: Cambridge Advanced Learner's Dictionary [home, info]
9. -by, b'y, by, by-: Wiktionary [home, info]
10. by, by-: Webster's New World College Dictionary, 4th Ed. [home, info]
11. by, by-: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. by: Infoplease Dictionary [home, info]
13. BY, .by, b.y, by-: Dictionary.com [home, info]
14. by: Online Etymology Dictionary [home, info]
15. by: UltraLingua English Dictionary [home, info]
16. by: Cambridge Dictionary of American English [home, info]
17. by: Cambridge International Dictionary of Idioms [home, info]
18. .BY, By, .by: Wikipedia, the Free Encyclopedia [home, info]
19. by: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. By: Online Plain Text English Dictionary [home, info]
21. by: Webster's Revised Unabridged, 1913 Edition [home, info]
22. by: Rhymezone [home, info]
23. by: AllWords.com Multi-Lingual Dictionary [home, info]
24. by: Webster's 1828 Dictionary [home, info]
25. by, by-: MyWord.info [home, info]
26. BY, .by: Stammtisch Beau Fleuve Acronyms [home, info]
27. by: All About Homonyms [home, info]
28. By: Dictionary of Phrase and Fable (1898) [home, info]
29. by: Free Dictionary [home, info]
30. by: Mnemonic Dictionary [home, info]
31. by: WordNet 1.7 Vocabulary Helper [home, info]
32. by: LookWAYup Translating Dictionary/Thesaurus [home, info]
33. b.y, by, by-: Dictionary/thesaurus [home, info]
34. by: Wikimedia Commons US English Pronunciations [home, info]

Art (2 matching dictionaries)

35. BY, By: Glossary of Stamp Collecting Terms [home, info]
36. By: Glossary of Stamp Collecting Terms [home, info]

Business (4 matching dictionaries)

37. BY: MoneyGlossary.com [home, info]
38. BY: Bloomberg Financial Glossary [home, info]
39. by: Legal dictionary [home, info]
40. BY: Financial dictionary [home, info]

Computing (2 matching dictionaries)

41. by: Free On-line Dictionary of Computing [home, info]
42. by: Encyclopedia [home, info]

Medicine (1 matching dictionary)

43. by, by-: online medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

44. BY: Navajo Code Talkers' Dictionary [home, info]
45. by: Sound-Alike Words [home, info]
46. BY: Acronym Finder [home, info]
47. BY: AbbreviationZ [home, info]
48. by: Idioms [home, info]

Religion (1 matching dictionary)

49. By: Easton Bible [home, info]

Science (1 matching dictionary)

50. by: A Dictionary of Quaternary Acronyms and Abbreviations [home, info]

Slang (1 matching dictionary)

51. By, b'y, by: Urban Dictionary [home, info]

Tech (1 matching dictionary)

52. BY: Farrier & Hoofcare [home, info]

(Note: See bying for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (by) ▸ adverb:  so as to pass a given point ▸ adverb:  in reserve; not for immediate use ("Put something by for her old age") ▸ Also see bying ▸ Word origin ▸ Words similar to by ▸ Usage examples for by ▸ Idioms related to by (New!) ▸ Words that often appear near by ▸ Rhymes of by ▸ Invented words related to by