Sorry, no online dictionaries contain the exact phrase proper operation.
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Reverse dictionary results:
1. effectiveness
 2. efficiency
3. function
4. functionality
5. functioning
6. performance
7. well-being
8. set
9. upkeep
10. adjustment
 11. application
12. arm
13. atm
14. aut
15. business
16. call
17. catch
18. compliance
19. conduct
20. control
 21. coordination
22. correct
23. direction
24. distribution
25. done
26. dress
27. enforcement
28. exercise
29. exercising
30. failure
 31. fic
32. fitting
33. fix
34. functions
35. implementation
36. kind
37. lay
38. line
39. maintenance
40. operate

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