Latin word iustus comes from Proto-Indo-European *h₂ey-, and later Proto-Indo-European *h₂óyu (Long time, lifetime.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *h₂ey- | Proto-Indo-European (ine) | |
| *h₂óyu | Proto-Indo-European (ine) | Long time, lifetime. |
| *h₂yew- | Proto-Indo-European (ine) | |
| *h₂yew-es-tos | Proto-Indo-European (ine) | |
| *jowos | Proto-Italic (itc-pro) | Law. Oath. |
| *jowestos | Proto-Italic (itc-pro) | Just, lawful. |
| iustus | Latin (lat) | (figurative) exact, straight, direct. Just, righteous. Justified, merited, well-deserved, due. Lawful, legal. |