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We found 37 dictionaries with English definitions that include the word ad lib:
Click on the first link on a line below to go directly to a page where "ad lib" is defined.

General (26 matching dictionaries)

1. ad-lib: Webster's New World College Dictionary, 4th Ed. [home, info]
2. ad-lib, ad lib: The Wordsmyth English Dictionary-Thesaurus [home, info]
3. ad lib: Infoplease Dictionary [home, info]
4. ad-lib, ad lib, ad lib: Dictionary.com [home, info]
5. ad lib: Online Etymology Dictionary [home, info]
6. ad-lib, ad lib: UltraLingua English Dictionary [home, info]
7. ad-lib: Cambridge Dictionary of American English [home, info]
8. Ad Lib (album), Ad Lib (comedy show), Ad Lib (typeface), Ad-lib, Ad lib (disambiguation), Ad lib: Wikipedia, the Free Encyclopedia [home, info]
9. ad-lib, ad lib: Rhymezone [home, info]
10. ad-lib, ad lib, ad lib: Stammtisch Beau Fleuve Acronyms [home, info]
11. ad-lib, ad lib: Free Dictionary [home, info]
12. ad-lib, ad lib: Mnemonic Dictionary [home, info]
13. ad-lib, ad lib: WordNet 1.7 Vocabulary Helper [home, info]
14. ad-lib, ad lib: LookWAYup Translating Dictionary/Thesaurus [home, info]
15. ad-lib, ad lib: Dictionary/thesaurus [home, info]
16. ad-lib, ad lib: Merriam-Webster.com [home, info]
17. ad lib: Oxford Dictionaries [home, info]
18. ad-lib, ad lib: American Heritage Dictionary of the English Language [home, info]
19. ad-lib, ad-lib: Collins English Dictionary [home, info]
20. ad-lib, ad lib: Vocabulary.com [home, info]
21. ad-lib, ad-lib, ad-lib: Macmillan Dictionary [home, info]
22. ad-lib, ad lib: Wordnik [home, info]
23. ad-lib, ad lib: Cambridge Advanced Learner's Dictionary [home, info]
24. ad-lib, ad lib: Wiktionary [home, info]

Art (2 matching dictionaries)

25. AD LIB: Technical Glossary of Theatre Terms [home, info]
26. Ad lib: Virginia Tech Multimedia Music Dictionary [home, info]

Business (1 matching dictionary)

27. Ad lib: Radio Programming and Production [home, info]

Computing (1 matching dictionary)

28. ad-lib, ad lib: Encyclopedia [home, info]

Medicine (4 matching dictionaries)

29. Ad lib: MedTerms.com Medical Dictionary [home, info]
30. ad lib: online medical dictionary [home, info]
31. ad-lib, ad. lib, ad lib, ad lib: Medical dictionary [home, info]
32. Ad lib: Drug Medical Dictionary [home, info]

Miscellaneous (3 matching dictionaries)

33. AD LIB: Acronym Finder [home, info]
34. ad lib: A Word A Day [home, info]
35. AD LIB: AbbreviationZ [home, info]

(Note: See ad_libs for more definitions.)

Quick definitions from WordNet (ad lib) ▸ adverb:  without advance preparation ("He spoke ad lib") ▸ Also see ad_libs ▸ Word origin ▸ Words similar to ad lib ▸ Usage examples for ad lib ▸ Words that often appear near ad lib ▸ Rhymes of ad lib ▸ Invented words related to ad lib