antidifferentiate

The story

1. Proto-Indo-European*h₂ent-
2. Proto-Indo-European*h₂énts
3. Proto-Indo-European*h₂énti
4. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
5. Ancient Greekἀντι- (anti-)
6. Englishanti-
7. Proto-Indo-European*dwóh₁
8. Proto-Indo-European*trísinflu.
9. Proto-Indo-European*d(w)is-
10. Proto-Italic*dis-
11. Latindis-
12. Proto-Indo-European*bʰer-
13. Proto-Indo-European*bʰéreti
14. Proto-Italic*ferō
15. Latinferō
16. Latindifferō
17. Latindifferēns
18. Latindifferentia
19. New Latindifferentiō
20. New Latindifferentiātus
21. Englishdifferentiate
22. Englishdifferentiation
23. Englishantidifferentiationbf.
24. English todayantidifferentiate

Back-formation from antidifferentiation, equivalent to anti- + differentiate.