Etymologically

Etymology and origin of the Ancient Greek word ἀεί

Confidence
Established
Formation
Inherited
First attested
700s BC Homer, Iliad More words from the 8th century BC
Inherited from
Proto-Hellenic *aiweí
Ultimate origin
Proto-Indo-European *h₂ei-u-

Pronunciation

  • 5th-century BC Attic: /a.ěː/[1]
  • 4th-century AD Koine: /aˈi/[1]
  • 10th-century Byzantine: /aˈi/[1]

Forms

ᾱ̆̓εί (āeí) [1] Homeric and Ionic αἰεί (aieí), epic αἰέν (aién), Doric αἰές (aiés), Aeolic ἄι (ái).[2][3] Inscriptions of Cyprus, Locris and Phocis keep the digamma, ⟨αἰϝεί⟩.[3][4]

Etymology

It is inherited from Proto-Hellenic *aiweí,[1] from *αἰϝέσι (*aiwési), the locative of an s-stem meaning “lifetime”; without the ending the same stem gives Doric αἰές (aiés).[3][4] Beside it stood an n-stem, seen in epic αἰέν (aién) and in αἰών (aiṓn, “lifetime, eternity”).[3][4] Both are extensions of a u-stem from Proto-Indo-European *h₂ei-u- (“lifetime, vital force”).[3][1][5] The Attic form is the one that lost the ⟨ι⟩ of αἰεί (aieí).[4][5]

Cognate with Latin aevum (“age, lifetime”), Gothic 𐌰𐌹𐍅𐍃 (aiws, “age, time”) and a Sanskrit neuter meaning “lifetime”.[3][4]

Earliest recorded meaning

Homer uses αἰεί and αἰέν, “always, for ever”, often with words of duration such as “unceasingly”, and the Attic form also occurs three times in Homer.[6][4][7]

Semantic evolution

Besides “for ever, continually”, from the time of Aeschylus it meant “at any given moment”: ὁ ἀεὶ βασιλεύων in Herodotus is “the king of the day”, and ὁ ἀεὶ χρόνος is eternity.[2][6] With the article it named the immortals, οἱ ἀεὶ ὄντες, in Xenophon.[6]

In the New Testament the Second Letter to the Corinthians speaks of those who are “always rejoicing”.[8] From it came ἀΐδιος (aḯdios, “eternal”) and εἰσαεί (eisaeí, “for ever”).[4][1]

Modern Greek keeps αεί (aeí) as a learned word, and as the prefix αει- in compounds such as αειπάρθενος “ever-virgin”.[9][5]

Timeline

  • Homer – The Iliad and the Odyssey use αἰεί and αἰέν for “always”.[6][10]
  • 5th century BC – Herodotus calls the king of the day ὁ αἰεὶ βασιλεύων.[6]
  • 4th century BC – Plato uses it in phrases such as “always, every day”.[6]
  • 1st century AD – The Second Letter to the Corinthians speaks of being always joyful.[8]
  • Modern Greek – The word survives as a learned adverb and the prefix αει- (aei-).[9][5]

Meanings

Adverb

  1. Always, for ever.[2][6]
  2. Continually, all the time.[2]
  3. At any given time, in each case: “whoever is in power at the moment”.[2][6]
  4. (with the article) Eternal: ὁ ἀεὶ χρόνος “eternity”, οἱ ἀεὶ ὄντες “the immortals”.[6]

Word family

  • εἰσαεί (eisaeí)
  • ἀΐδιος (āḯdios)

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Diggle, James, et al., eds. (2021), The Cambridge Greek Lexicon, Cambridge: Cambridge University Press
  3. ^ a b c d e f Beekes, Robert S. P. (2010), Etymological Dictionary of Greek, with the assistance of Lucien van Beek, Leiden Indo-European Etymological Dictionary Series 10, Leiden; Boston: Brill
  4. ^ a b c d e f g Frisk, Hjalmar (1960–1972), Griechisches etymologisches Wörterbuch, 3 vols, Heidelberg: Carl Winter
  5. ^ a b c d Babiniotis, Georgios (2010), Ετυμολογικό λεξικό της νέας ελληνικής γλώσσας [Etymological Dictionary of Modern Greek], Athens: Κέντρο Λεξικολογίας
  6. ^ a b c d e f g h i Liddell, Henry George; Scott, Robert; Jones, Henry Stuart (1940), A Greek-English Lexicon, 9th ed., Oxford: Clarendon Press
  7. ^ Cunliffe, Richard John (1924), A Lexicon of the Homeric Dialect, London: Blackie and Son
  8. ^ a b Bauer, Walter; Danker, Frederick W., et al. (2000), A Greek-English Lexicon of the New Testament and Other Early Christian Literature, 3rd ed., Chicago: University of Chicago Press
  9. ^ a b Ινστιτούτο Νεοελληνικών Σπουδών (Ίδρυμα Μανόλη Τριανταφυλλίδη) (1998), Λεξικό της κοινής νεοελληνικής, Thessaloniki: Aristotle University of Thessaloniki
  10. ^ Keersmaekers, Alek (2021–2025), GLAUx: The Greek Language Automated corpus, https://github.com/alekkeersmaekers/glaux

Related etymologies

Cite this entry

“Ἀεί.” Etymologically, 13 Nov. 2026, etymologically.com/grc/%E1%BC%80%CE%B5%CE%AF. Accessed 14 Nov. 2026.

Last edited on . ·