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We found 36 dictionaries with English definitions that include the word eff:
Click on the first link on a line below to go directly to a page where "eff" is defined.

General (20 matching dictionaries)

1. eff: Merriam-Webster.com [home, info]
2. eff, eff: Oxford Dictionaries [home, info]
3. eff: Collins English Dictionary [home, info]
4. eff: Vocabulary.com [home, info]
5. eff: Macmillan Dictionary [home, info]
6. Eff, eff: Wordnik [home, info]
7. eff: Cambridge Advanced Learner's Dictionary [home, info]
8. EFF, eff: Wiktionary [home, info]
9. eff: Infoplease Dictionary [home, info]
10. EFF, eff: Dictionary.com [home, info]
11. EFF, Eff (duo), Eff: Wikipedia, the Free Encyclopedia [home, info]
12. eff: Cambridge International Dictionary of Phrasal Verbs [home, info]
13. eff: Rhymezone [home, info]
14. eff: Webster's 1828 Dictionary [home, info]
15. EFF: Stammtisch Beau Fleuve Acronyms [home, info]
16. eff: Free Dictionary [home, info]
17. eff: Mnemonic Dictionary [home, info]
18. eff: WordNet 1.7 Vocabulary Helper [home, info]
19. eff: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. eff: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

21. EFF: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business (2 matching dictionaries)

22. eff: Travel Industry Dictionary [home, info]
23. EFF: Glossary of Trade and Shipping Terms [home, info]

Computing (6 matching dictionaries)

24. EFF: Free On-line Dictionary of Computing [home, info]
25. EFF: Netlingo [home, info]
26. EFF: CCI Computer [home, info]
27. EFF: Technology Terms and Acronyms [home, info]
28. EFF: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
29. eff: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

30. EFF: online medical dictionary [home, info]
31. EFF: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

32. EFF: Acronym Finder [home, info]
33. EFF: Three Letter Words with definitions [home, info]
34. EFF: AbbreviationZ [home, info]

Tech (2 matching dictionaries)

35. EFF: Webster's New World Telecom Dictionary [home, info]
36. EFF: Explosives [home, info]

(Note: See effs for more definitions.)

Quick definitions from WordNet (eff) ▸ verb:  have sexual intercourse with ▸ Also see effs ▸ Words similar to eff ▸ Usage examples for eff ▸ Words that often appear near eff ▸ Rhymes of eff ▸ Invented words related to eff