intercommunal

The story

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁n̥tér
3. Proto-Italic*n̥ter
4. Latininter
5. Latininter-
6. Englishinter-
7. Proto-Indo-European*mey-
8. Proto-Indo-European*ḱom-moy-ni-s
9. Proto-Italic*kommoinis
10. Old Latincomoinis
11. Latincommūnis
12. Proto-Indo-European*h₂el-
13. Proto-Indo-European*h₂élisder.?
14. Late Latincommūnāli
15. Frenchcommuna
16. Englishcommunal
17. English todayintercommunal

From inter- + communal.