Sorry, no online dictionaries contain the exact phrase opposite of deterioration.
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Reverse dictionary results:
1. decline
 2. retreat
3. failure
4. wear
5. far
6. worse
7. change
8. declension
9. declination
10. escalation
 11. rot
12. slack
13. slacking
14. slacks
15. slump
16. slumping
17. soil conservation
18. weather
19. pasteurization
20. breakdown
 21. damage
22. decay
23. degeneration
24. detrimental
25. dilapidation
26. expense
27. impairment
28. intensification
29. lapse
30. lapsing
 31. pejoration
32. rust
33. slide
34. tube
35. back
36. bak
37. box
38. cast
39. casted
40. catch-22

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