Sorry, no online dictionaries contain the exact phrase theory was used to support system.

Reverse dictionary results:
1. justify
 2. uphold
3. validate
4. corroborate
5. substantiate
6. accord
7. answer to
8. ascertain
9. assess
10. bear out
 11. confirm
12. prove
13. verify
14. acceptance
15. apprise
16. assert
17. attribute
18. constate
19. recognize
20. soothe
 21. support
22. try
23. valuate
24. admission
25. agree
26. agreer
27. appraisal
28. appraise
29. appraisee
30. appraising
 31. apprizing
32. asseverate
33. assize
34. attest
35. authenticate
36. compromise
37. con

You can look up the words in the phrase individually using these links:   theory ?   was ?   used ?   to ?   support ?   system ?
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