Sorry, no online dictionaries contain the exact phrase proper functioning.
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Reverse dictionary results:
1. efficiency
 2. effectiveness
3. functionality
4. performance
5. operation
6. efficient
7. practical
8. applicative
9. applicatory
10. availing
 11. corrigibly
12. effect
13. effectful
14. effecting
15. effection
16. effective
17. effectivity
18. effectual
19. effectuall
20. effectuation
 21. executional
22. functional requirement
23. good
24. in effect
25. operative
26. resultful
27. actualization
28. actualized
29. capability
30. capacity
 31. efficacity
32. expedience
33. instrumentality
34. performant
35. productive
36. qualitate
37. result

You can look up the words in the phrase individually using these links:   proper ?   functioning ?
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