ἐνιαυτός

According to Beekes, the etymology is unknown, and he criticizes some of the proposals to date, including Meillet's that the first part is ἔνος (énos, “year”), as in δίενος (díenos, “two years old”), and the second one is from ἰαύω (iaúō).

ἐνῐαυτός • (enĭautós) m (genitive ἐνῐαυτοῦ); second declension (Epic, Attic, Ionic, Koine)

1. anniversary
2. year

   Synonym: ἔτος (étos)

   • 50 CE – 100 CE, Acts of the Apostles 11:26:

     ἐγένετο δὲ αὐτούς ἐνιαυτὸν ὅλον συναχθῆναι ἐν τῇ ἐκκλησίᾳ καὶ διδάξαι ὄχλον ἱκανόν […]

     egéneto dè autoús eniautòn hólon sunakhthênai en tēî ekklēsíāi kaì didáxai ókhlon hikanón […]

     For a whole year they met with the church and taught a great many people. (ESV)

• Beekes, Robert S. P. (2010), Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN, page 426
• “ἐνιαυτός”, in Liddell & Scott (1940), A Greek–English Lexicon, Oxford: Clarendon Press
• “ἐνιαυτός”, in Liddell & Scott (1889), An Intermediate Greek–English Lexicon, New York: Harper & Brothers
• “ἐνιαυτός”, in Autenrieth, Georg (1891), A Homeric Dictionary for Schools and Colleges, New York: Harper and Brothers
• ἐνιαυτός in Bailly, Anatole (1935), Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
• ἐνιαυτός in Cunliffe, Richard J. (1924), A Lexicon of the Homeric Dialect: Expanded Edition, Norman: University of Oklahoma Press, published 1963
• ἐνιαυτός in the Diccionario Griego–Español en línea (2006–2026)
• “ἐνιαυτός”, in Slater, William J. (1969), Lexicon to Pindar, Berlin: Walter de Gruyter
• G1763 in Strong, James (1979), Strong’s Exhaustive Concordance to the Bible
• Woodhouse, S. C. (1910), English–Greek Dictionary: A Vocabulary of the Attic Language‎^[1], London: Routledge & Kegan Paul Limited.
  • year idem, page 995.