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Latin word aeternus comes from Proto-Indo-European *h₂ey-, Proto-Indo-European *h₂eyu-, and later Proto-Italic *aiwom (Age.)
*h₂ey- (Proto-Indo-European)
*h₂eyu- (Proto-Indo-European)
*h₂ey-u- (Proto-Indo-European)
*aiwo- (Proto-Italic)
*aiwom (Proto-Italic)
Age.
aivom (Old Latin)
Age. Time, lifetime.
aevom (Latin)
aetatis (Latin)
aeviternum (Latin)
aeternus (Latin)
Eternal, endless. Immortal. Permanent, lasting, perpetual.