We found 21 dictionaries that define the word definitively:

General (17 matching dictionaries)

1. definitively: Merriam-Webster
2. definitively: Oxford Learner's Dictionaries
3. definitively: Collins English Dictionary
4. definitively: Vocabulary.com
5. Definitively, definitively: Wordnik
6. definitively: Cambridge Advanced Learner's Dictionary
7. definitively: Wiktionary
8. Definitively, definitively: Dictionary.com
9. Definitively: Wikipedia, the Free Encyclopedia
10. Definitively: Online Plain Text English Dictionary
11. definitively: Webster's Revised Unabridged, 1913 Edition
12. Definitively: AllWords.com Multi-Lingual Dictionary
13. definitively: Webster's 1828 Dictionary
14. definitively: FreeDictionary.org
15. definitively: TheFreeDictionary.com

Business (1 matching dictionary)

16. definitively: Legal dictionary

Computing (1 matching dictionary)

17. definitively: Encyclopedia

Medicine (2 matching dictionaries)

18. definitively: Merriam-Webster Medical Dictionary
19. definitively: Medical dictionary

(Note: See definitive as well.)

Definitions from Wiktionary (definitively) ▸ adverb:  In a way that is not only decisive, but also conclusive and final. Similar: conclusively, decisively, finally, for good and all, definitely, decidedly, determinatively, concludingly, once and for all, determinately, more... Types: absolutely, definitely, undoubtedly, indisputably, unquestionably, indubitably, more... Phrases: determine definitively, definitively outlined, more... ▸ Words similar to definitively ▸ Usage examples for definitively ▸ Idioms related to definitively ▸ Wikipedia articles (New!) ▸ Words that often appear near definitively ▸ Rhymes of definitively ▸ Invented words related to definitively