Sorry, no online dictionaries contain the exact phrase upgrading of classification.
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Reverse dictionary results:
1. upgrade
2. reclassification
3. gentrification
4. lift
5. promotion
6. raise
7. refinement
8. upgraded
9. alteration
10. better
11. development
12. graduation
13. repair
14. aaa
15. above
16. brachiopoda
17. breed
18. category
19. class
20. confidential
21. degree
22. disposal
23. disposition
24. geometry
25. grade
26. hierarchy
27. kingdom
28. linnaeus
29. method
30. mode
31. placement
32. placing
33. range
34. ranged
35. ranging
36. rank
37. ranked
38. ranking
39. rating
40. restricted

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You can look up the words in the phrase individually using these links:   upgrading ?   of ?   classification ?
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