aeternus

• ēternus (Medieval Latin, Merovingian)

For older aeviternus, from aevum, from Proto-Indo-European *h₂eyu- (“long time, lifetime”). Morphologically (but not semantically) equivalent to aetās +‎ -rnus.

• (Classical Latin) IPA^(key): [ae̯ˈtɛr.nʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [eˈt̪ɛr.nus]

aeternus (feminine aeterna, neuter aeternum, adverb aeternō); first/second-declension adjective

1. abiding, lasting, permanent, perpetual

   Synonyms: perennis, assiduus, continuātus, perpetuus, diuturnus

   • Lucius Annaeus Seneca, Hercules Furens:

     Non prata viridi laeta facie germinant,/nec adulta leni fluctuat Zephyro seges;/non ulla ramos silva pomiferos habet;/sterilis profundi vastitas squalet soli/et foeda tellus torpet aeterno situ— rerumque maestus finis et mundi ultima.

     "No meadows bud, joyous with verdant, / mature waves in the gentle west wind, nor crop; / there is no grove of fruit bearing branches to regard; / barren: and the abysmal fields lie all untilled, / and the foul land lies torpid in abiding sufferance- sad end of things, and the world 's last."

2. endless, eternal
3. immortal

   Synonym: immortālis

First/second-declension adjective.

• ab aeternō
• aeternālis
• aeternitās
• aeternō

• aetās

• “aeternus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “aeternus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• aeternus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.