Latin word diem comes from Proto-Indo-European *dyew-, and later Proto-Indo-European *dyḗws (Sky god. Sky, heaven.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *dyew- | Proto-Indo-European (ine) | god, sky, sky, sky, heaven |
| *dyḗws | Proto-Indo-European (ine) | Sky god. Sky, heaven. |
| *djous | Proto-Italic (itc-pro) | Jupiter. Day, sky. |
| diovos | Latin (lat) | |
| dies | Latin (lat) | (often in the feminine) A set day: a date, an appointment.. A day, particularly:. A solar or sidereal day of about 24 hours, especially (historical) Roman dates reckoned from one midnight to the next.. Daytime: a period of light between sunrise and sunset. |