nonfictional

The story

1. Proto-Indo-European*né
2. Proto-Germanic*ne
3. Proto-Indo-European*ís?
4. Proto-Indo-European*h₁óynos
5. Proto-Germanic*ainaz
6. Proto-Germanic*nainaz
7. Proto-West Germanic*nain
8. Old Englishnān
9. Middle Englishnon
10. Old Englishnān
11. Old Englishnān-
12. Middle Englishnon-
13. Englishnon-
14. Proto-Indo-European*dʰeyǵʰ-
15. Proto-Indo-European*dʰinéǵʰti
16. Proto-Italic*θingō
17. Proto-Italic*fingō
18. Latinfingō
19. Latinfictiō
20. Old Frenchficcion
21. Middle Englishficcioun
22. Englishfiction
23. Proto-Indo-European*h₂el-
24. Proto-Indo-European*h₂élisder.?
25. Englishfictional
26. English todaynonfictional

From non- + fictional.