Where does “eternal” come from?

eternal (Old French) comes from Latin aeternālis, from Latin aeternus, from Latin aevum, from Latin aevom, from Old Latin aivom, from Proto-Italic aiwom, from Proto-Indo-European h₂eyu-, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

Ancestry of “eternal”, step by step

eternal traces back through two separate lines of ancestry.

via Latin aeternālis

StepLanguageWordMeaning
1Latinaeternāliseternal, everlasting, temporally infinite
2Latinaeternusabiding, lasting, permanent, perpetual; eternal,...
3Latinaevumtime as a single, unified, continuous and...
4LatinaevomArchaic form of aevum
5Old Latinaivomtime, lifetime; age
6Proto-Italicaiwomage
7Proto-Indo-Europeanh₂eyu-vitality; eternal; vital force, life, long life,...
8Proto-Indo-Europeanh₂ey-vital force, life, age, eternity; day, morning

via Late Latin aeternalis

StepLanguageWordMeaning
1Late Latinaeternaliseverlasting, eternal

Words derived from “eternal

Every word from Proto-Indo-European h₂ey-Every word from Proto-Indo-European h₂eyu-Every word from Proto-Italic aiwom