| 1 | English | eternal | Lasting forever; unending; existing outside time;... |
| 2 | Middle English | eternal | Eternal, permanent; having existed forever;... |
| 3 | Old French | eternal | — |
| 4 | Latin | aeternālis | — |
| 5 | Latin | aeternus | abiding, lasting, permanent, perpetual; eternal,... |
| 6 | Latin | aevum | time as a single, unified, continuous and... |
| 7 | Latin | aevom | Archaic form of aevum |
| 8 | Old Latin | aivom | time, lifetime; age |
| 9 | Proto-Italic | aiwom | age |
| 10 | Proto-Indo-European | h₂eyu- | vitality; eternal; vital force, life, long life,... |
| 11 | Proto-Indo-European | h₂ey- | vital force, life, age, eternity; day, morning |