Sorry, no online dictionaries contain the exact phrase theoretical underpinnings of a notion.

Reverse dictionary results:
1. abstraction
 2. concept
3. prolepsis
4. basis
5. catastrophism
6. fundament
7. theoretically
8. metaphysics
9. dogma
10. theory
 11. aestheticism
12. apriorism
13. base
14. conventionalism
15. ecofeminism
16. fit
17. fitted
18. heresy
19. historiography
20. hypostasis
 21. ideology
22. infralapsarianism
23. intuitionism
24. mysticism
25. new maths
26. philosophically
27. positivism
28. postulate
29. postulation
30. probabilism
 31. recondite
32. representationalism
33. supralapsarianism
34. transcendentalism
35. thought
36. -ism
37. abcs
38. absolutism
39. agnosticism
40. architecture

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