normalise

The story

1. Proto-Indo-European*ǵneh₃-
2. Proto-Indo-European*ǵn̥h₃sḱéti
3. Proto-Hellenic*gignṓskō
4. Ancient Greekγιγνώσκω (gignṓskō)
5. Ancient Greekγνώμων (gnṓmōn)
6. Latinnorma
7. Proto-Indo-European*h₂el-
8. Proto-Indo-European*h₂élisder.?
9. Latinnōrmālis
10. Englishnormal
11. English todaynormalise

From normal + -ise.