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We found 49 dictionaries with English definitions that include the word op:
Click on the first link on a line below to go directly to a page where "op" is defined.

General (21 matching dictionaries)

1. OP, op: Merriam-Webster.com [home, info]
2. OP, Op, o.p, op, op, op-: Oxford Dictionaries [home, info]
3. OP, op: American Heritage Dictionary of the English Language [home, info]
4. OP, o.p, op: Collins English Dictionary [home, info]
5. op, op: Macmillan Dictionary [home, info]
6. OP, Op, op, oP: Wordnik [home, info]
7. Op, op, op: Cambridge Advanced Learner's Dictionary [home, info]
8. OP, Op, op: Wiktionary [home, info]
9. op, op-: Webster's New World College Dictionary, 4th Ed. [home, info]
10. op-: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. OP: Infoplease Dictionary [home, info]
12. o.p, op, op, op-: Dictionary.com [home, info]
13. op: UltraLingua English Dictionary [home, info]
14. op: Cambridge Dictionary of American English [home, info]
15. OP, Op (statistics), Op: Wikipedia, the Free Encyclopedia [home, info]
16. op: AllWords.com Multi-Lingual Dictionary [home, info]
17. op, op-: MyWord.info [home, info]
18. OP, OP: Stammtisch Beau Fleuve Acronyms [home, info]
19. OP, o.p, op: Dictionary/thesaurus [home, info]

Art (6 matching dictionaries)

20. O.P: Technical Glossary of Theatre Terms [home, info]
21. Op: Virginia Tech Multimedia Music Dictionary [home, info]
22. op-: A Cross Reference of Latin and Greek Elements [home, info]
23. O.P: Glossary of Stamp Collecting Terms [home, info]
24. OP: ANIME AND MANGA GLOSSARY [home, info]
25. OP: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business (6 matching dictionaries)

26. OP: Travel Industry Dictionary [home, info]
27. op: Glossary of Legal Terms [home, info]
28. Op(1): Glossary of research economics [home, info]
29. OP: Abbreviations in shipping [home, info]
30. OP: Legal dictionary [home, info]
31. O.P: Glossary of Trade and Shipping Terms [home, info]

Computing (3 matching dictionaries)

32. op: Free On-line Dictionary of Computing [home, info]
33. OP: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
34. OP: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

35. op, op-: online medical dictionary [home, info]
36. OP: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

37. o.p, o.p, o.p: Terminology and Descriptions of Geneaological Words [home, info]
38. OP: Acronym Finder [home, info]
39. OP: AbbreviationZ [home, info]

Science (1 matching dictionary)

40. OP, op: Cytokines & Cells Online Pathfinder Encyclopaedia [home, info]

Slang (3 matching dictionaries)

41. O.P: Street Terms: Drugs and the Drug Trade [home, info]
42. Op, o.p, the op: Urban Dictionary [home, info]
43. Op: Twists, Slugs and Roscoes: Hardboiled Slang [home, info]

Tech (4 matching dictionaries)

44. OP: AUTOMOTIVE TERMS [home, info]
45. OP: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]
46. OP: PhotoNotes Dictionary of Film and Digital Photography [home, info]
47. op: Book Collectors' Glossary [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from Wiktionary (op) ▸ noun:  (informal) An operation. ▸ noun:  (informal) An amateur radio operator. ▸ noun:  (Internet) An operator on IRC, who can moderate the chat channel, ban users, etc. ▸ noun:  (chiefly attributive) Op art; a style of abstract art. ▸ verb:  (transitive, Internet) To promote (an IRC user) to an operator. ▸ noun:  (Internet slang) Alternative letter-case form of OP (“original post, original poster”) ▸ noun:  (slang, among criminal gangs) Clipping of opposition. ▸ noun:  Initialism of Overall Position. ▸ noun:  (theater) Initialism of opposite prompt; stage right, ▸ noun:  (Internet) Initialism of original poster; the person who started a thread. ▸ noun:  (Internet) Initialism of original post. ▸ noun:  (military, law enforcement) Initialism of observation post. ▸ noun:  (organic chemistry) Abbreviation of organophosphate. ▸ adjective:  (publishing) Abbreviation of out of print. ▸ adjective:  Abbreviation of overproof. ▸ adjective:  (video games) Abbreviation of overpowered. ▸ adjective:  (Internet, music) Initialism of overplayed. ▸ noun:  (religious) Initialism of Ordo Praedicatorum (Order of Preachers, the Dominicans, a religious order). ▸ noun:  Initialism of opening credits. ▸ noun:  Initialism of opening theme. ▸ Words similar to op ▸ Usage examples for op ▸ Popular adjectives describing op ▸ Popular nouns described by op ▸ Words that often appear near op ▸ Rhymes of op ▸ Invented words related to op