Etymologically

ἑβδομάς

Etymology and origin of the Ancient Greek word ἑβδομάς

Confidence
Established
Formation
Derivation
First attested
700–500 BC Solon
Ultimate origin
Ancient Greek ἑπτά
Etymology tree
inherited borrowed derived
Ancient Greek ἑβδομάς
Latin hebdomada

Pronunciation

  • 5th-century BC Attic: /heb.do.más/[1]
  • 4th-century AD Koine: /eβ.ðoˈmas/[1]
  • 10th-century Byzantine: /ev.ðoˈmas/[1]

Forms

ἑβδομᾰ́ς (hebdomás) f (genitive ἑβδομᾰ́δος); third declension[1]

Etymology

It is formed from Ancient Greek ἕβδομος (hébdomos, “seventh”) + -άς (-ás), and the ordinal is itself formed from ἑπτά (heptá, “seven”).[1][2]

Earliest recorded meaning

Its first record is in Solon, where it means a period of seven years in a human life.[3][4][5]

Semantic evolution

Besides seven years, the word could mean any group of seven: the number seven itself, seven of anything (an epigram counts two sevens of Niobe's children), and above all seven days, a week.[4][3][5] The medical writers counted the course of diseases and of the growing embryo in such weeks, and a work ascribed to Hippocrates was titled “On Sevens”.[3] Aristotle reports the division of life into seven-year ages.[3][4]

In the Septuagint the word is the Jewish week, and the “feast of weeks” is named after it; the word can also mean the sabbath itself or, in Daniel, a week of years.[6][3] Josephus too uses it for the sabbath.[7][3] Babiniotis traces the week of seven days that is still used to the Jewish calendar.[2]

Medieval Greek kept it as εβδομάδα (evdomáda) (also βδομάδα (vdomáda)), built on the accusative, and used it for a week and, in the phrase “a week of years”, for seven years.[8][9] In Modern Greek εβδομάδα (evdomáda) is the week, and Holy Week before Easter is the “Great Week”.[9] Latin borrowed the word as Latin hebdomas, from which English took hebdomad in the 16th century.[10][11]

Timeline

  • 7th–6th century BC – Solon uses it for a period of seven years.[3][4]
  • 5th century BC – Empedocles and the Hippocratic writers count in weeks of seven days.[3]
  • 4th century BC – Aristotle mentions dividing human life into periods of seven years.[3][5]
  • 3rd–2nd century BC – The Septuagint uses it for the week, the feast of weeks and the sabbath.[6][3]
  • 2nd century BC – Antipater of Sidon uses it for a group of seven.[3][4]
  • 1st century AD – Josephus uses it for the sabbath, and Philo for the number seven.[7][4]
  • 5th century AD – A papyrus counts three weeks of fasting.[3]
  • 1100–1669 – Vernacular Greek has εβδομάδα (evdomáda) for a week.[8]
  • 1540s – English borrows hebdomad through Latin, first in the sense “the number seven”.[11]

Meanings

Noun

  1. The number seven.[4][5]
  2. A group of seven.[4][3]
  3. A period of seven days, a week.[4][3][7]
  4. (Septuagint) The seventh day of the week, the sabbath.[6][3]
  5. A period of seven years.[4][3][5]
  • ἕβδομος (hébdomos)
  • ἑπτά (heptá)
  • Latin hebdomas
  • English hebdomad

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b Babiniotis, Georgios (2010), Ετυμολογικό λεξικό της νέας ελληνικής γλώσσας [Etymological Dictionary of Modern Greek], Athens: Κέντρο Λεξικολογίας
  3. ^ a b c d e f g h i j k l m n o p Rodríguez Adrados, Francisco, et al., eds. (1980–), Diccionario Griego-Español, Madrid: CSIC, http://dge.cchs.csic.es/xdge
  4. ^ a b c d e f g h i j Liddell, Henry George; Scott, Robert; Jones, Henry Stuart (1940), A Greek-English Lexicon, 9th ed., Oxford: Clarendon Press
  5. ^ a b c d e Diggle, James, et al., eds. (2021), The Cambridge Greek Lexicon, Cambridge: Cambridge University Press
  6. ^ a b c Lust, Johan; Eynikel, Erik; Hauspie, Katrin (2003), Greek-English Lexicon of the Septuagint, rev. ed., Stuttgart: Deutsche Bibelgesellschaft
  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. ^ a b Kriaras, Emmanuel, Επιτομή του Λεξικού της μεσαιωνικής ελληνικής δημώδους γραμματείας 1100–1669, Κέντρο Ελληνικής Γλώσσας, https://www.greek-language.gr
  9. ^ a b Ινστιτούτο Νεοελληνικών Σπουδών (Ίδρυμα Μανόλη Τριανταφυλλίδη) (1998), Λεξικό της κοινής νεοελληνικής, Thessaloniki: Aristotle University of Thessaloniki
  10. ^ Saalfeld, Günther Alexander (1874), Index Graecorum vocabulorum in linguam latinam translatorum, Berlin: Weidmann
  11. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com

Borrowed into

Cite this entry

“Ἑβδομάς.” Etymologically, 1 Nov. 2026, etymologically.com/grc/%E1%BC%91%CE%B2%CE%B4%CE%BF%CE%BC%CE%AC%CF%82. Accessed 2 Nov. 2026.

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