Sorry, no online dictionaries contain the exact phrase at the heart.
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Reverse dictionary results:
1. central
2. core
3. fundamental
4. essential
5. pivotal
6. built-in
7. basic
8. constitutive
9. crucial
10. cruciality
11. general
12. imperative
13. cardinal
14. coessential
15. essentiality
16. instrumental
17. mission-critical
18. of the essence
19. prevalently
20. substantive
21. superessential
22. vital
23. chiefly
24. consequential
25. generally
26. in general
27. main
28. main thing
29. mainstream
30. predominately
31. roundly
32. significant
33. supe
34. behavior
35. by and large
36. capital

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