Sorry, no online dictionaries contain the exact phrase demonstrate decisively.
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Reverse dictionary results:
1. prove
2. establish
3. confirm
4. validate
5. substantiate
6. answer to
7. constate
8. justify
9. verify
10. accord
11. ascertain
12. ascertainment
13. assert
14. assess
15. attribute
16. authenticate
17. congree
18. enable
19. recognize
20. support
21. acceptance
22. affirm
23. affirmer
24. appraisal
25. appraising
26. apprise
27. apprizing
28. attest
29. aver
30. bear out
31. certify
32. compromise
33. consense
34. consubstantiate
35. homologate

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