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

General (30 matching dictionaries)

1. informal: Merriam-Webster.com [home, info]
2. informal: Oxford Dictionaries [home, info]
3. informal: American Heritage Dictionary of the English Language [home, info]
4. informal: Collins English Dictionary [home, info]
5. informal: Vocabulary.com [home, info]
6. informal: Macmillan Dictionary [home, info]
7. Informal, informal: Wordnik [home, info]
8. informal: Cambridge Advanced Learner's Dictionary [home, info]
9. informal: Wiktionary [home, info]
10. informal: Webster's New World College Dictionary, 4th Ed. [home, info]
11. informal: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. informal: Infoplease Dictionary [home, info]
13. informal: Dictionary.com [home, info]
14. informal: Online Etymology Dictionary [home, info]
15. informal: UltraLingua English Dictionary [home, info]
16. informal: Cambridge Dictionary of American English [home, info]
17. Informal (attire), Informal: Wikipedia, the Free Encyclopedia [home, info]
18. Informal: Online Plain Text English Dictionary [home, info]
19. informal: Webster's Revised Unabridged, 1913 Edition [home, info]
20. informal: Rhymezone [home, info]
21. informal, informal: AllWords.com Multi-Lingual Dictionary [home, info]
22. informal: Webster's 1828 Dictionary [home, info]
23. informal: Free Dictionary [home, info]
24. informal: Mnemonic Dictionary [home, info]
25. informal: WordNet 1.7 Vocabulary Helper [home, info]
26. informal: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. informal: Dictionary/thesaurus [home, info]
28. informal: UVic Writer's Guide [home, info]

Business (2 matching dictionaries)

29. informal: Glossary of Legal Terms [home, info]
30. informal: Legal dictionary [home, info]

Computing (1 matching dictionary)

31. informal: Encyclopedia [home, info]

Medicine (1 matching dictionary)

32. informal: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

33. informal: Stanford Encyclopedia of Philosophy [home, info]

Slang (1 matching dictionary)

34. Informal: Urban Dictionary [home, info]

(Note: See informally for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (informal) ▸ adjective:  not officially recognized or controlled ("An informal agreement") ▸ adjective:  not formal ("Conservative people unaccustomed to informal dress") ▸ adjective:  used of spoken and written language ▸ adjective:  having or fostering a warm or friendly atmosphere; especially through smallness and informality ("A relaxed informal manner") ▸ Also see informally ▸ Word origin ▸ Words similar to informal ▸ Usage examples for informal ▸ Popular nouns described by informal ▸ Words that often appear near informal ▸ Rhymes of informal ▸ Invented words related to informal