Latin word aevum comes from Proto-Indo-European *h₂ey-, Proto-Indo-European *h₂eyu-, and later Proto-Indo-European *h₂óyu (Long time, lifetime.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *h₂ey- | Proto-Indo-European (ine-pro) | |
| *h₂eyu- | Proto-Indo-European (ine-pro) | |
| *h₂óyu | Proto-Indo-European (ine-pro) | Long time, lifetime. |
| *aiwom | Proto-Italic (itc-pro) | Age. |
| aivom | Old Latin (itc-ola) | Age. Time, lifetime. |
| aevom | Latin (lat) | |
| aevum | Latin (lat) | (Medieval Latin, philosophy) aevum, the mean between time and eternity, aeviternity. Lifetime, age, generation. Time, eternity. |