Sorry, no online dictionaries contain the exact phrase rational sphere.
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Reverse dictionary results:
1. level
2. figure
3. philosophy
4. irreducible
5. absurd
6. animal
7. blind
8. coherent
9. discontinuity
10. efficiency
11. intellectual
12. intellectualize
13. mental
14. nous
15. philosopher
16. rationalize
17. rationalizing
18. reason
19. refer
20. sensible
21. soul
22. stable
23. argument
24. conjugate
25. conjunctive
26. ground
27. idea
28. management
29. mind
30. mindfulness
31. mixed
32. numbing
33. passion
34. personal
35. ratiocination
36. sober
37. sound
38. understanding
39. eudemonia
40. personify

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