Etymologically

Etymology and origin of the Latin word aeon

Confidence
Established
Formation
Borrowing
First attested
c. 160–220 AD, Tertullian
Borrowed from
Ancient Greek αἰών
Ultimate origin
Ancient Greek αἰών
Etymology tree
inherited borrowed derived
Ancient Greek αἰών
Latin aeon

Pronunciation

  • Classical: [ˈae̯.oːn][1]
  • Ecclesiastical: [ˈɛː.on][1]

Forms

aeōn m (genitive aeōnis); third declension[1]

Etymology

It is borrowed from Ancient Greek αἰών (aiṓn, “age, eternity”).[1][2][3] The Greek word goes back to Proto-Hellenic *aiwṓn and ultimately to Proto-Indo-European *h₂eyu- (“vital force, life”).[1][3][4]

Earliest recorded meaning

Tertullian (c. 160–220 AD)[3] uses it for the Aeons of the Gnostics, eternal entities in the system of Valentinus, who, as Lewis & Short put it, held them to be gods.[2][5][6]

Semantic evolution

The Latin translation of Irenaeus uses the word for the same Gnostic beings, and a glossary renders aeonas by saecula “ages”.[7]

In medieval Latin it meant eternity, a century or simply a span of time,[8] and charters use it in solemn formulas: one of 972 speaks of the beginning “of this aeon”,[9] and one of 995 has in eona eonum “for ever and ever”.[10] British writers also use it for the personified Aeons of the heretics.[10] English borrowed it from Late Latin in the 1640s as eon.[4]

Timeline

  • c. 160–220 AD – Tertullian writes of the Aeons of the Valentinian Gnostics.[6][5][3]
  • beginning of the 10th century – Eugenius Vulgarius uses it.[3]
  • 972 – A charter speaks of the beginning “of this aeon”.[9]
  • 995 – A charter, in a 12th-century copy, has in eona eonum “for ever and ever”.[10]
  • 1640s – English borrows it as eon.[4]

Meanings

Noun

  1. (Late Latin) An age; eternity.[1][8][10]
  2. (Late Latin) One of the Aeons, the eternal beings of Gnostic teaching.[2][5][6][1]
  3. (Medieval Latin) A century, or a span of time.[8]

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  3. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  5. ^ a b c Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  6. ^ a b c Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  7. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  8. ^ a b c Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  9. ^ a b du Cange, Charles du Fresne, et al. (1883–1887), Glossarium mediae et infimae latinitatis, augmented ed. by Léopold Favre, Niort: L. Favre
  10. ^ a b c d Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press

Related etymologies

Cite this entry

“Aeon.” Etymologically, 25 Oct. 2026, etymologically.com/la/aeon. Accessed 25 Oct. 2026.

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