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We found 69 dictionaries with English definitions that include the word jack:
Click on the first link on a line below to go directly to a page where "jack" is defined.

General (38 matching dictionaries)

1. jack: Merriam-Webster.com [home, info]
2. Jack, jack, jack, jack, jack: Oxford Learner's Dictionaries [home, info]
3. jack: American Heritage Dictionary of the English Language [home, info]
4. jack, the jack: Collins English Dictionary [home, info]
5. Jack, jack: Vocabulary.com [home, info]
6. Jack, jack: Wordnik [home, info]
7. jack: Cambridge Advanced Learner's Dictionary [home, info]
8. Jack: InfoVisual Visual Dictionary [home, info]
9. Jack, jack: Wiktionary [home, info]
10. Jack, jack (n.), jack (v.): Online Etymology Dictionary [home, info]
11. Jack, jack: UltraLingua English Dictionary [home, info]
12. jack: Cambridge Dictionary of American English [home, info]
13. jack: Cambridge International Dictionary of Idioms [home, info]
14. J.A.C.K, JACK, Jack (A.M. Homes novel), Jack (BioShock), Jack (Chacma baboon), Jack (John Farnham album), Jack (TV series), Jack (Tekken), Jack (Tree), Jack (Ulf Lundell novel), Jack (album), Jack (baboon), Jack (band), Jack (card), Jack (cat), Jack (chacma baboon), Jack (character), Jack (connector), Jack (device), Jack (disambiguation), Jack (film), Jack (fish), Jack (flag), Jack (given name), Jack (hero), Jack (human modeling), Jack (magazine), Jack (mascot), Jack (mechanical), Jack (name), Jack (playing card), Jack (song), Jack (surname), Jack (tree), Jack (webcomic), Jack, The Jack: Wikipedia, the Free Encyclopedia [home, info]
15. jack: Cambridge International Dictionary of Phrasal Verbs [home, info]
16. Jack: Online Plain Text English Dictionary [home, info]
17. jack: Webster's Revised Unabridged, 1913 Edition [home, info]
18. jack: Rhymezone [home, info]
19. jack: AllWords.com Multi-Lingual Dictionary [home, info]
20. jack: Webster's 1828 Dictionary [home, info]
21. jack, jack-: MyWord.info [home, info]
22. Jack: E Cobham Brewer, The Reader's Handbook [home, info]
23. Jack: Dictionary of Phrase and Fable (1898) [home, info]
24. Jack: 1911 edition of the Encyclopedia Britannica [home, info]
25. jack: Free Dictionary [home, info]
26. jack: The Phrontistery - A Dictionary of Obscure Words [home, info]
27. jack: Mnemonic Dictionary [home, info]
28. jack: WordNet 1.7 Vocabulary Helper [home, info]
29. jack: Dictionary/thesaurus [home, info]
30. jack: Wikimedia Commons US English Pronunciations [home, info]
31. jack: Webster's New World College Dictionary, 4th Ed. [home, info]
32. Jack, jack: LookWAYup Translating Dictionary/Thesaurus [home, info]
33. jack-: Webster's New World College Dictionary, 4th Ed. [home, info]
34. jack, jack-: The Wordsmyth English Dictionary-Thesaurus [home, info]
35. jack: Infoplease Dictionary [home, info]
36. jack: Dictionary.com [home, info]

Art (4 matching dictionaries)

37. JACK: Technical Glossary of Theatre Terms [home, info]
38. JACK: Shakespeare Glossary [home, info]
39. Jack: Virginia Tech Multimedia Music Dictionary [home, info]
40. Jack: Jazz Humor [home, info]

Business (2 matching dictionaries)

41. jack: Travel Industry Dictionary [home, info]
42. jack: Legal dictionary [home, info]

Computing (2 matching dictionaries)

43. jack: CCI Computer [home, info]
44. Jack (Tekken), Jack (device), jack: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

45. jack: online medical dictionary [home, info]
46. jack: Medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

47. Jack, Jack: baby names list [home, info]
48. JACK, JACK, JACK: Terminology and Descriptions of Geneaological Words [home, info]
49. JACK: Acronym Finder [home, info]
50. JACK: AbbreviationZ [home, info]
51. jack: Idioms [home, info]

Slang (6 matching dictionaries)

52. Jack (Jones), jack: English slang and colloquialisms used in the United Kingdom [home, info]
53. Jack: Totally Unofficial Rap [home, info]
54. Jack: Street Terms: Drugs and the Drug Trade [home, info]
55. Jack: A Seattle Lexicon [home, info]
56. the jack: Urban Dictionary [home, info]
57. Jack: Twists, Slugs and Roscoes: Hardboiled Slang [home, info]

Sports (3 matching dictionaries)

58. Jack: A Few Falconry Terms [home, info]
59. Jack: 2060 Shadow-Slang [home, info]
60. Jack: Sports Definitions [home, info]

Tech (7 matching dictionaries)

61. jack: Electronics [home, info]
62. Jack: AUTOMOTIVE TERMS [home, info]
63. JACK: Farrier & Hoofcare [home, info]
64. jack: SeaTalk Dictionary of English Nautical Language [home, info]
65. Jack: Sweetwater Music [home, info]
66. Jack, Jack: Latitude Mexico [home, info]
67. jack: Webster's New World Telecom Dictionary [home, info]

(Note: See jacks for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (jack) ▸ noun:  male donkey ▸ noun:  any of several fast-swimming predacious fishes of tropical to warm-temperate seas ▸ noun:  tool for exerting pressure or lifting ▸ noun:  one of four face cards in a deck bearing a picture of a young prince ▸ noun:  small flag indicating a ship's nationality ▸ noun:  game equipment consisting of one of several small objects picked up while bouncing a ball in the game of jacks ▸ noun:  an electrical device consisting of a connector socket designed for the insertion of a plug ▸ noun:  a small worthless amount ("You don't know jack") ▸ noun:  immense East Indian fruit resembling breadfruit of; its seeds are commonly roasted ▸ noun:  someone who works with their hands; someone engaged in manual labor ▸ noun:  a man who serves as a sailor ▸ verb:  lift with a special device ("Jack up the car so you can change the tire") ▸ verb:  hunt with a jacklight ▸ name:  A male given name (rare: 1 in 317 males; popularity rank in the U.S.: #53) ▸ name:  A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1852) ▸ name:  A female given name (common: 1 in 100000 females; popularity rank in the U.S.: #3217) ▸ Also see jacks ▸ Word origin ▸ Words similar to jack ▸ Usage examples for jack ▸ Idioms related to jack (New!) ▸ Popular adjectives describing jack ▸ Words that often appear near jack ▸ Rhymes of jack ▸ Invented words related to jack