Middle English word on- comes from Old English ond-, Old English an- (One, uni-, only. Sole, single, solitary; alone.), Proto-Indo-European *enew, Proto-Indo-European *Hwenh₁-
| Dictionary entry | Language | Definition |
|---|---|---|
| ond- | Old English (ang) | |
| an- | Old English (ang) | One, uni-, only. Sole, single, solitary; alone. |
| *enew | Proto-Indo-European (ine-pro) | |
| *Hwenh₁- | Proto-Indo-European (ine-pro) | |
| *ēno | Proto-Germanic (gem-pro) | |
| *wēniz | Proto-Germanic (gem-pro) | Belief. Hope, expectation. |
| ván | Old Norse (non) | |
| on- | Middle English (enm) |