interanion

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*h₂en-
8. Proto-Hellenic*aná
9. Ancient Greekᾰ̓νᾰ́ (ănắ)
10. Ancient Greekᾰ̓νᾰ- (ănă-)
11. Proto-Indo-European*h₁ey-
12. Proto-Indo-European*h₁éyti
13. Proto-Hellenic*éimi
14. Ancient Greekῐ̓όν (ĭón)
15. Ancient Greekἀνῐόν (anĭón)
16. Englishanion
17. English todayinteranion

From inter- + anion.