decategorization

The story

1. Proto-Indo-European*de
2. Proto-Indo-European*déh₁
3. Proto-Italic*dē
4. Latindē
5. Latindē-
6. Englishde-
7. Proto-Indo-European*ḱe?
8. Proto-Indo-European*ḱóm
9. Proto-Indo-European*ḱm̥-th₂der.?
10. Proto-Hellenic*kətá
11. Ancient Greekκᾰτᾰ́ (kătắ)
12. Ancient Greekκᾰτᾰ- (kătă-)
13. Proto-Indo-European*h₂ger-
14. Proto-Indo-European*h₂goréh₂
15. Proto-Hellenic*agorā́
16. Ancient Greekᾰ̓γορᾱ́ (ăgorā́)
17. Ancient Greekἀγορεύω (agoreúō)
18. Ancient Greekκᾰτήγορος (kătḗgoros)
19. Ancient Greekκᾰτηγορέω (kătēgoréō)
20. Ancient Greekκατηγορία (katēgoría)
21. Late Latincatēgoria
22. Middle Frenchcategorie
23. Frenchcatégorie
24. Englishcategory
25. Englishcategorize
26. Englishcategorization
27. English todaydecategorization

From de- + categorization.