Sorry, no online dictionaries contain the exact phrase upgrading or extension of the classification.

Reverse dictionary results:
1. mongolian
2. gentrification
3. promotion
4. raise
5. upgrade
6. lift
7. refinement
8. upgraded
9. renewal
10. tab
11. range
12. degree
13. grade
14. ranged
15. ranging
16. ranked
17. ranking
18. rating
19. advance
20. advancement
21. advancing
22. aisle
23. auxesis
24. barpost
25. elevate
26. exalt
27. floor plan
28. form
29. highly
30. horizon
31. inflation
32. jump
33. occlusion
34. oost
35. outward
36. porch
37. posted
38. preferment
39. reinstatement
40. rise

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You can look up the words in the phrase individually using these links:   upgrading ?   or ?   extension ?   of ?   the ?   classification ?
(A question mark next to a word above means that we couldn't find it, but clicking the word might provide spelling suggestions.)

Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
upgr*to search for words beginning with upgr, or
*tionto search for words ending with tion
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