The story
- Proto-Indo-European*h₁én
- Proto-Indo-European*h₁n̥tér
- Proto-Italic*n̥ter
- Latininter
- Latininter-
- Englishinter-
- Englishdivision
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishdivisional
- English todayinterdivisional
From inter- + divisional.
Etymology from Wiktionary, CC BY-SA 4.0.