Sorry, no online dictionaries contain the exact phrase main key.
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Reverse dictionary results:
1. primary
 2. essential
3. critical
4. vital
5. imperative
6. built-in
7. crucial
8. instrumental
9. mission-critical
10. of the essence
 11. prevalently
12. capitally
13. cardinal
14. central
15. coessential
16. consequential
17. constitutive
18. core
19. key
20. predominately
 21. by and large
22. chiefly
23. cruciality
24. desert island
25. main
26. main thing
27. mainspring
28. majorly
29. meaningful
30. more
 31. mostly
32. pivotal
33. predominantly
34. relevant
35. significant
36. significative
37. summum bonum
38. ultimately

You can look up the words in the phrase individually using these links:   main ?   key ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
main*to search for words beginning with main, or
* keyto search for words ending with key
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