English word once comes from Proto-Indo-European *óynos (One. Single.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *óynos | Proto-Indo-European (ine) | One. Single. |
| *ainaz | Proto-Germanic (gem-pro) | (in the plural) some. (in the singular) one. |
| ān | Old English (ang) | |
| ones | Middle English (enm) | |
| once | English (en) | As soon as; when; after. (frequency) One and only one time.. (mathematics) Multiplied by one: indicating that a number is multiplied by one.. (obsolete) At a future time.. (temporal location) Formerly; during some period in the past.. As soon as. |