Latin word esse comes from Proto-Indo-European *wes-, Classical Armenian *եստ, Proto-Indo-European *bʰowHéyeti, and later Proto-Italic *fuiō (To become.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *wes- | Proto-Indo-European (ine) | fat, moisture, to dress, stab, to stick, prick, pierce, sting, moist, wet |
| *եստ | Classical Armenian (xcl) | |
| *bʰowHéyeti | Proto-Indo-European (ine) | |
| *fuiō | Proto-Italic (itc-pro) | To become. |
| *wesaną | Proto-Germanic (gem-pro) | To consume, feast To be. To exist. To remain. |
| *h₁ésmi | Proto-Indo-European (ine) | |
| *h₁esmi- | Proto-Indo-European (ine) | to be |
| *h₁ésti | Proto-Indo-European (ine) | To be. |
| *h₂wéseti | Proto-Indo-European (ine) | To dwell, remain. |
| *ezom | Proto-Italic (itc-pro) | Be. |
| *som | Proto-Italic (itc-pro) | |
| esom | Old Latin (itc-ola) | |
| esse | Latin (lat) |