Sorry, no online dictionaries contain the exact phrase determine definitively.
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Reverse dictionary results:
1. confirm
2. ascertain
3. establish
4. verify
5. validate
6. answer to
7. attribute
8. prove
9. substantiate
10. accord
11. assert
12. assess
13. authenticate
14. congree
15. constate
16. enable
17. justify
18. ok
19. stipulate
20. support
21. valuate
22. acceptance
23. accommodation
24. affirmer
25. agree
26. allow for
27. answer for
28. appraisal
29. appraising
30. apprise
31. ascertainment
32. assessment
33. asseverate
34. assize
35. attest
36. aver

You can look up the words in the phrase individually using these links:   determine ?   definitively ?
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