εἰς

• ἐς (es)
• ἐνς (ens) — Doric

From earlier ἐνς (ens), as attested in Doric, from Proto-Hellenic *en-s, from Proto-Indo-European *h₁én (“in”), from which also ἐν (en, “in, at, on”). Possibly created to contrast with ἐν (en) as the result of analogy with the pair ἐκ (ek) / ἐξ (ex), of which the latter is the older form (see *h₁éǵʰs); the -/s/ in ἐξ (ex) is ultimately from the PIE genitive–ablative marker *-(e)s.^[1]

The accusative is from the pre-PIE directional.

εἰς • (eis) (governs the accusative)

1. into
   εἰς τὴν πόλιν

   eis tḕn pólin

   into the city

2. to, unto
   εἰς τοὺς αἰῶνας τῶν αἰώνων

   eis toùs aiônas tôn aiṓnōn

   unto the ages of the ages

• εἰς ὄνῠχᾰ (eis ónŭkhă)

• Greek: εις (eis), σε (se)

• “εἰς”, in Liddell & Scott (1940), A Greek–English Lexicon, Oxford: Clarendon Press
• “εἰς”, in Liddell & Scott (1889), An Intermediate Greek–English Lexicon, New York: Harper & Brothers
• “εἰς”, in Autenrieth, Georg (1891), A Homeric Dictionary for Schools and Colleges, New York: Harper and Brothers
• εἰς in Bailly, Anatole (1935), Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
• εἰς in Cunliffe, Richard J. (1924), A Lexicon of the Homeric Dialect: Expanded Edition, Norman: University of Oklahoma Press, published 1963
• εἰς in the Diccionario Griego–Español en línea (2006–2025)
• “εἰς”, in Slater, William J. (1969), Lexicon to Pindar, Berlin: Walter de Gruyter
• G1519 in Strong, James (1979), Strong’s Exhaustive Concordance to the Bible
• Beekes, Robert S. P. (2010), “εἰς”, in Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN, page 394