Etymologically

Etymology and origin of the Ancient Greek word ἅπαξ

Confidence
Probable
Formation
Compound
First attested
Homer, Odyssey
Ultimate origin
Proto-Indo-European *sem-,*peh₂ǵ-

Pronunciation

  • 5th-century BC Attic: /há.paks/[1]
  • 4th-century AD Koine: /ˈa.paks/[1]
  • 10th-century Byzantine: /ˈa.paks/[1]

Forms

ᾰ̔́πᾰξ (hápax) [1]

Etymology

It is from Ancient Greek ἁ- (ha-) + -παξ (-pax): the first part is *sm̥- (“one”), the zero grade of Proto-Indo-European *sem- (“one”) (as in εἷς (heîs, “one”) and ἅμα (háma, “together”)), and the second belongs to πήγνυμι (pḗgnumi, “to fix, make solid”), from Proto-Indo-European *peh₂ǵ- (“to make firm”), with the adverbial -s.[2][3] Babiniotis mentions the idea that it first meant “with one stroke”.[4]

Wiktionary finds the second part obscure and mentions a shortening of *sm̥-pn̥kʷu- (“all one”), compared with Latin cūnctus (“all”).[1]

Earliest recorded meaning

Its first record is in the Odyssey, which contrasts the “twice-dying” with other men, who die only once.[5][3][6]

Semantic evolution

In Classical Greek it means “once, once only”, and also “once and for all”, “at once”: a speaker in the Odyssey would rather lose his life once and for all than waste away slowly.[3][5] With a participle it means “once that”, as in Aeschylus' line that once a man has died there is no rising again.[3] “Once more” is an expression of Aeschylus, and Herodotus has “once a year”.[3][5] Plato uses it in arithmetic, of multiplying by one.[3][5]

Grammarians used it of words found only once in Greek literature, as in a papyrus of the 7th century AD; from this comes the phrase ἅπαξ λεγόμενον (hápax legómenon, “said once”).[3][1] In the Epistle to the Hebrews it is said of Christ, offered once.[7]

Modern Greek άπαξ (ápax) is a learned word; in popular use it also means “since, seeing that”.[8][9]

Timeline

  • Homer – The Odyssey uses it for dying only once.[5][3]
  • 6th–5th century BC – Aeschylus uses it with a participle and in “once more”.[3][5]
  • 5th century BC – Herodotus uses it with a genitive, “once a year”.[3][5]
  • 4th century BC – Plato uses it in arithmetic, “multiplied by one”.[3][5]
  • New Testament – The Epistle to the Hebrews uses it of Christ, offered once.[7]
  • 7th century AD – A papyrus uses it of words found only once in an author.[3]

Meanings

Adverb

  1. Once, only one time; with a genitive, once in a period of time.[3][5][7]
  2. Once and for all, definitively.[3][5]
  3. (with a participle) Once that, as soon as.[3]
  4. (mathematics) Multiplied by one.[3][5]
  5. (grammar) Of words found only once in the literature.[3]
  6. (late) At some time, ever.[3]

Usage notes

The phrase ἅπαξ λεγόμενον (hápax legómenon) “said once”, with the passive participle of λέγω (légō), names a word recorded only once.[1]

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ 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
  3. ^ a b c d e f g h i j k l m n o p q r Rodríguez Adrados, Francisco, et al., eds. (1980–), Diccionario Griego-Español, Madrid: CSIC, http://dge.cchs.csic.es/xdge
  4. ^ Babiniotis, Georgios (2010), Ετυμολογικό λεξικό της νέας ελληνικής γλώσσας [Etymological Dictionary of Modern Greek], Athens: Κέντρο Λεξικολογίας
  5. ^ a b c d e f g h i j k Liddell, Henry George; Scott, Robert; Jones, Henry Stuart (1940), A Greek-English Lexicon, 9th ed., Oxford: Clarendon Press
  6. ^ Keersmaekers, Alek (2021–2025), GLAUx: The Greek Language Automated corpus, https://github.com/alekkeersmaekers/glaux
  7. ^ a b c 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
  8. ^ Ινστιτούτο Νεοελληνικών Σπουδών (Ίδρυμα Μανόλη Τριανταφυλλίδη) (1998), Λεξικό της κοινής νεοελληνικής, Thessaloniki: Aristotle University of Thessaloniki
  9. ^ Kriaras, Emmanuel, Επιτομή του Λεξικού της μεσαιωνικής ελληνικής δημώδους γραμματείας 1100–1669, Κέντρο Ελληνικής Γλώσσας, https://www.greek-language.gr
Cite this entry

“Ἅπαξ.” Etymologically, 24 Oct. 2026, etymologically.com/grc/%E1%BC%85%CF%80%CE%B1%CE%BE. Accessed 24 Oct. 2026.

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