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We found 75 dictionaries with English definitions that include the word open:
Click on the first link on a line below to go directly to a page where "open" is defined.

General (31 matching dictionaries)

1. open: Merriam-Webster.com [home, info]
2. Open, open: Oxford Learner's Dictionaries [home, info]
3. open: American Heritage Dictionary of the English Language [home, info]
4. open, the open: Collins English Dictionary [home, info]
5. open: Vocabulary.com [home, info]
6. open, open, the Open, the open: Macmillan Dictionary [home, info]
7. OPen, Open, open: Wordnik [home, info]
8. open, the open: Cambridge Advanced Learner's Dictionary [home, info]
9. open: Wiktionary [home, info]
10. open: Webster's New World College Dictionary, 4th Ed. [home, info]
11. open: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. open: Infoplease Dictionary [home, info]
13. OPEN, the open: Dictionary.com [home, info]
14. open (adj.): Online Etymology Dictionary [home, info]
15. open: UltraLingua English Dictionary [home, info]
16. open: Cambridge Dictionary of American English [home, info]
17. open: Cambridge International Dictionary of Idioms [home, info]
18. OPEN (Indian magazine), OPEN (magazine), Open (Blues Image album), Open (Cowboy Junkies album), Open (Gotthard album), Open (Indian magazine), Open (Jon Anderson EP), Open (Jon Anderson album), Open (Shaznay Lewis album), Open (Stick Men album), Open (The Necks album), Open (band), Open (curling), Open (disambiguation), Open (film), Open (process), Open (sport), Open (system call), Open (topology), Open, The Open (band), The Open (disambiguation), The Open: Wikipedia, the Free Encyclopedia [home, info]
19. open: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. Open: Online Plain Text English Dictionary [home, info]
21. open: Webster's Revised Unabridged, 1913 Edition [home, info]
22. open: Rhymezone [home, info]
23. open, open: AllWords.com Multi-Lingual Dictionary [home, info]
24. open: Webster's 1828 Dictionary [home, info]
25. open: Free Dictionary [home, info]
26. open: Mnemonic Dictionary [home, info]
27. open: WordNet 1.7 Vocabulary Helper [home, info]
28. open: LookWAYup Translating Dictionary/Thesaurus [home, info]
29. open: Dictionary/thesaurus [home, info]

Art (5 matching dictionaries)

30. Open: Epicurus.com Cheese Glossary [home, info]
31. Open: Epicurus.com Wine Glossary [home, info]
32. OPEN: Shakespeare Glossary [home, info]
33. Open: Virginia Tech Multimedia Music Dictionary [home, info]
34. Open: Movie Terminology Glossary [home, info]

Business (10 matching dictionaries)

35. Open: MoneyGlossary.com [home, info]
36. open: Webster's New World Law Dictionary [home, info]
37. open: INVESTORWORDS [home, info]
38. open: Glossary of Legal Terms [home, info]
39. Open: Bloomberg Financial Glossary [home, info]
40. open: Glossary of research economics [home, info]
41. Open: Futures and Options Market Terminology [home, info]
42. Open: Investopedia [home, info]
43. open: Legal dictionary [home, info]
44. Open: Financial dictionary [home, info]

Computing (5 matching dictionaries)

45. open: Free On-line Dictionary of Computing [home, info]
46. open: Netlingo [home, info]
47. open: Computer Telephony & Electronics Dictionary and Glossary [home, info]
48. Open: I T Glossary [home, info]
49. Open (mathematics), Open (topology), open: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

50. open: online medical dictionary [home, info]
51. OPEN: Vocabulary of Loss: Suicide, Grief, and Ethics [home, info]
52. open: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

53. OPEN: Acronym Finder [home, info]
54. OPEN: AbbreviationZ [home, info]
55. open: Idioms [home, info]

Science (4 matching dictionaries)

56. Open: Eric Weisstein's World of Mathematics [home, info]
57. open, open, open, open, open: PlanetMath Encyclopedia [home, info]
58. open: Anthropology dictionary [home, info]
59. open: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

60. open: The Folk File [home, info]

Sports (6 matching dictionaries)

61. Open: Dan's Poker [home, info]
62. Open, open: Sports Terms [home, info]
63. Open: winyourwager.com Gambling Glossary [home, info]
64. open, open: Hickok Sports Glossaries [home, info]
65. Open: Texas Hold'em Dictionary [home, info]
66. open: Golfer's Dictionary [home, info]

Tech (7 matching dictionaries)

67. open: Agriculture Glossary [home, info]
68. Open (cow): Dairy Glossary [home, info]
69. Open: Glossary of Cheese Terms [home, info]
70. open: Printed Circuit Design and Manufacturing Glossary [home, info]
71. OPEN: Lake and Water Word Glossary [home, info]
72. Open: Sweetwater Music [home, info]
73. Open: Wine Taster's Glossary [home, info]

(Note: See opens for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (open) ▸ noun:  information that has become public ("All the reports were out in the open") ▸ noun:  a tournament in which both professionals and amateurs may play ▸ noun:  a clear or unobstructed space or expanse of land or water ("Finally broke out of the forest into the open") ▸ noun:  where the air is unconfined ("The concert was held in the open air") ▸ verb:  display the contents of a file or start an application as on a computer ▸ verb:  begin or set in action, of meetings, speeches, recitals, etc. ("He opened the meeting with a long speech") ▸ verb:  start to operate or function or cause to start operating or functioning ("Open a business") ▸ verb:  have an opening or passage or outlet ("The bedrooms open into the hall") ▸ verb:  make available ("This opens up new possibilities") ▸ verb:  become available ("An opportunity opened up") ▸ verb:  make the opening move ("Kasparov opened with a standard opening") ▸ verb:  cause to open or to become open ("Mary opened the car door") ▸ verb:  become open ("The door opened") ▸ verb:  afford access to ("The door opens to the patio") ▸ verb:  spread out or open from a closed or folded state ("Open the map") ▸ adjective:  sincere and free of reserve in expression ("Please be open with me") ▸ adjective:  lax in enforcing laws ("An open town") ▸ adjective:  without undue constriction as from e.g. tenseness or inhibition ("The clarity and resonance of an open tone") ▸ adjective:  affording unobstructed entrance and exit; not shut or closed ("An open door") ▸ adjective:  affording free passage or access ("Open drains") ▸ adjective:  used of mouth or eyes ("Keep your eyes open") ▸ adjective:  having no protecting cover or enclosure ("An open boat") ▸ adjective:  of a set; containing points whose neighborhood consists of other points of the same set, or being the complement of an open set; of an interval; containing neither of its end points ▸ adjective:  open to or in view of all ("An open protest") ▸ adjective:  accessible to all ("Open season") ▸ adjective:  not sealed or having been unsealed ("The letter was already open") ▸ adjective:  not secret ("Open plans") ▸ adjective:  not brought to a conclusion; subject to further thought ("An open question") ▸ adjective:  ready for business ("The stores are open") ▸ adjective:  not having been filled ("The job is still open") ▸ adjective:  receptive to new ideas ("An open mind") ▸ adjective:  opened out ("An open newspaper") ▸ adjective:  relatively empty of and unobstructed by fences or hedges or headlands or shoals ("In open country") ▸ adjective:  openly straightforward and direct without reserve or secretiveness ("An open and trusting nature") ▸ adjective:  affording free passage or view ▸ adjective:  used of string or hole or pipe of instruments ▸ adjective:  open and observable; not secret or hidden ▸ adjective:  with no protection or shield ("Open to the weather") ▸ adjective:  (of textures) full of small openings or gaps ("An open texture") ▸ adjective:  possibly accepting or permitting ("Open to interpretation") ▸ adjective:  without any attempt at concealment; completely obvious ("Open disregard of the law") ▸ adjective:  not defended or capable of being defended ("An open city") ▸ Also see opens ▸ Word origin ▸ Words similar to open ▸ Usage examples for open ▸ Idioms related to open (New!) ▸ Popular adjectives describing open ▸ Popular nouns described by open ▸ Words that often appear near open ▸ Rhymes of open ▸ Invented words related to open