We found 27 dictionaries that define the word definitely:

General (23 matching dictionaries)

1. definitely: Merriam-Webster.com
2. definitely: Oxford Learner's Dictionaries
3. definitely: Collins English Dictionary
4. definitely: Vocabulary.com
5. Definitely, definitely: Wordnik
6. definitely: Cambridge Advanced Learner's Dictionary
7. definitely: Wiktionary
8. definitely: The Wordsmyth English Dictionary-Thesaurus
9. definitely: Infoplease Dictionary
10. Definitely, definitely: Dictionary.com
11. definitely: Cambridge Essential American English Dictionary
12. Definitely: Wikipedia, the Free Encyclopedia
13. Definitely: Online Plain Text English Dictionary
14. definitely: Webster's Revised Unabridged, 1913 Edition
15. definitely: Rhymezone
16. definitely: AllWords.com Multi-Lingual Dictionary
17. definitely: Free Dictionary
18. definitely: Mnemonic Dictionary
19. definitely: LookWAYup Translating Dictionary/Thesaurus
20. definitely: Dictionary/thesaurus
21. definitely: Wikimedia Commons US English Pronunciations

Business (2 matching dictionaries)

22. definitely: Legal dictionary
23. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

24. definitely: Encyclopedia

Miscellaneous (1 matching dictionary)

25. definitely: Idioms

(Note: See definite as well.)

Definitions from Wiktionary ( ) ▸ adverb:  Without question and beyond doubt. ▸ adverb:  In a definite manner; decisively. Similar: decidedly, unquestionably, emphatically, by all odds, certainly, probably, undoubtedly, def., surely, really, more... Opposite: uncertainly, doubtfully, ambiguously, questionably, unsurely Types: certainly, positively, without a doubt, absolutely, undoubtedly, more... Phrases: definitely not, Definitely Maybe, Definitely Maybe Tour, definitely should not, most definitely, more... ▸ Words similar to definitely ▸ Usage examples for definitely ▸ Idioms related to definitely ▸ Wikipedia articles (New!) ▸ Words that often appear near definitely ▸ Rhymes of definitely ▸ Invented words related to definitely