The story
- Proto-Indo-European*h₂ep
- Proto-Indo-European*h₂epó
- Proto-Italic*ap
- Latinab
- Latinab-
- Englishab-
- Proto-Indo-European*ǵneh₃-
- Proto-Indo-European*ǵn̥h₃sḱéti
- Proto-Hellenic*gignṓskō
- Ancient Greekγιγνώσκω (gignṓskō)
- Ancient Greekγνώμων (gnṓmōn)
- Latinnorma
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinnōrmālis
- Englishnormal
- Englishabnormal
- English todayabnormality
From abnormal + -ity. First attested in the mid 19th century.
Etymology from Wiktionary, CC BY-SA 4.0.