eternal (English)

Where does "eternal" come from?

The English adjective 'eternal' comes through Middle English from Old French 'eternal'[1], which was borrowed from Late Latin 'aeternālis'[1][2]. This Late Latin formation derives from Classical Latin 'aeternus', meaning 'eternal' or 'endless'[1][4], an older contraction of 'aeviternus'[3]. That earlier Latin term traces to 'aevum', meaning 'age' or 'lifetime'[1][3], which developed via Proto-Italic '*aiwom' from the Proto-Indo-European root '*h₂eyu-' or '*h₂ey-', meaning 'vital force' or 'long time'[3][5][6]. Upon entering English, the borrowed term largely displaced the native Old English word 'ēċe'[1].

Open questions

• The ultimate Proto-Indo-European root is reconstructed variously as '*h₂ey-' or the stem '*h₂eyu-', with shades of meaning ranging from vital force to an extended lifetime. [3] [5] [6] [7]

Full etymology tree

• eternal (English), 'Lasting forever; unending.'
  • inherited eternal (Middle English), 'Eternal, permanent; having existed (and existing) forever.'
    • borrowed eternal (Middle French)
      • derived aeternalis (Latin), 'eternal, everlasting, temporally infinite'
        • suffix aeternus (Latin), 'abiding, lasting, permanent, perpetual'
          • derived aeviternus (Latin), 'archaic form of aeternus (“eternal, perpetual”)'
            • derived aevum (Latin), 'eternity, agelessness, timelessness (time as a single, unified, continuous and limitless entity; infinite time, time without end)'
              • inherited *aiwom (Proto-Italic), 'age'
                • derived *h₂óyu (Proto-Indo-European), 'long time, lifetime'
                  • derived *h₂ey- (Proto-Indo-European), 'vital force, life, age, eternity'
        • affix -alis (Latin), 'Suffixed to nouns or numerals creating adjectives of relationship.'

Ancestors

• *h₂ey- (Proto-Indo-European)
• eternal (Middle English)
• aeternalis (Latin)
• aeternus (Latin)

Descendants and derived words

• coeternal (English)
• crater of eternal darkness (English)
• eternal black hole (English)
• eternalism (English)
• eternalist (English)
• eternality (English)
• eternalize (English)
• eternal life (English)
• eternally (English)
• eternalness (English)
• eternal now (English)
• eternal recurrence (English)

Sources

1. eternal (English) - Wiktionary
2. eternal (Middle English) - Wiktionary
3. aeternus (Latin) - Wiktionary
4. aeternalis (Latin) - Wiktionary
5. h₂óyu (Proto-Indo-European) - Wiktionary
6. aevum (Latin) - Wiktionary
7. aeviternus (Latin) - Wiktionary

Updated October 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris